Well... it's one of those things you'll just have to experience for yourself. My advice: try it and see.

However, realize one thing: you will NOT be able to change her. What you see is what you get. Make sure you're completely cool with that.

My experience with SP's and SJ's is that we don't have the same "depth" or "level" of connection that I have with other NF's or NT's. ESFP's and ESTP's are lots of fun to be around, but don't expect much one-on-one time and don't expect them to ever want to talk about abstract ideas.

My grandmother is an ES, and one thing my mother told me was to pay attention to what she does more than what she says if you want to understand their true feelings. Sorry, that's all I got.

I'd have to say ESFPs are my least favorite type of people in general. Probably because their inferior function is INFJ's dominant and vice versa...so it's Inferiority Complex time!
But I understand how they can be fun to be around, as has been said. I do think the "what you see is what you get" is accurate...don't expect to find deep philosophy brimming under the surface.

I've vowed never to date an S again, only Ns! But then I test 99% N so I guess that is an extreme preference.

If you're an INFJ guy, and she's an ESFP girl, I would recommend cancelling the relationship. In socionics that's called a supervisor/supervisee relationship with the ESFP as the supervisor and the INFJ as the supervisee. They're fun and spontaneous, but their impulsiveness will make you crazy. Enjoy the time, but keep it friends only.

Analyst,
Analyst,

First of all, try this yourself and only seek advice from this website. You do what you think is right. Second of all, you are heading in the right direction, in my opinion. Most of these folks have it wrong. Every person, at least who has marriage in mind somewhere, should be with their opposite (i.e. the ESTP in your case and mind). I would not totally rely on those personality tests. I would not be surprised if she was an ESTP. ESTP's tend to look like high strung emotional people (hence feeling), however, they just tend say blatantly and directly what they feel. They usually are not in tune with social norms, hence they will just speak as they see it. I do not know if this is the case with your lady, but the fact that you are "intrigued" is exactly how I felt when I met this one woman. Her test said she was an ENFJ from a personality test, but as I was around her more, it was evident that she was an ESTP. She was very direct and got right to the point, and kind of harsh, but definitely cool. Look at how your friend dresses. If she dresses in bright colors, wears somewhat expressive clothing, or seems kind of like a "girly-girl", she is likely an ESFP. If she is more direct and to the point and is kind of "boyish" she may be an ESTP. I say that this girl is definitely one you should try to get together with, because it will make you expand your boundaries as you said and better you (the point of dating and marrying an opposite). If you date someone too much like yourself (i.e. an INFJ or ENFJ), you will feel comfortable at first, but then you may get bored, as INFJ's especially need an energy spark from someone different (like an ESTP) who constantly one something new to experience everyday.

Dated an ESFP for two years. We broke up, but never really broke up. Had an extremely strong emotional connection (though she always claimed I had no emotions! Hey, what can I say? I'm an INFJ. It's tough for me to share with even those closest to me... especially when I think it may hurt the recipient of the feedback.), but never felt the mental connection. We're actually toying with the idea of getting back together (though that's still unspoken between us) after having split for a few years. She was great to me though. The main barrier to our relationship was that she wanted marriage, but I didn't - at that time. Now I think I'd like to get married, so it may work. I'm not sure.

I'm in the process of breaking up with an ENFP who drives me crazy. She's really cool - when she's around (physically and/or mentally). It was great for a few months, then she "left." Now she wants to use me as her guinea pig to learn more about self-control... something I know all too well... and something she's never heard of... everything must happen now! So annoying to me... though I have enjoyed the challenge.

My ESFP never drove me crazy at all... except to the extent that it was an outcrop of her desire for marriage conflicting with my non-desire. She's always fun to be around and it's incredibly easy to speak with her. Again though, it's the mental connection that seems lacking. I'm wondering though myself how big of a deal that is. For instance, us INFJs are ridiculously intense. I'm not sure I would want to marry someone as intense as me. It might scare me... or just tire me out. Or if we push some sort of common goal for years, then achieve it... do we go separate ways? I'm thinking a less intense person may be good for me for the long haul.

One last thing, forget about the tests... I'm definitely an I, but a weak I. I get my energy from solitude or one-on-one's. But I do genuinely enjoy groups of people... I just need to approach groups as though the person with whom I'm speaking is the only other person in the room... which has gotten me into trouble before when I've spent too long speaking with another girl... but that's a whole other story.

INFJ - ESFP... definitely can be fun. I haven't ruled it out yet.