I've recently (i.e. last night) been considering a move from ENTJ to ESTP, mainly due to having read this page.
I'm one step away from concluding that MBTI is rubbish, and that it is incompatible with my preferred system, socionics.
I am definitely an SLE in socionics, but this does not mean I'm an ESTP in MBTI or Keirsey. Firstly, although some aspects of the SP temperament - and more specifically ESTP - resonate with me (getting the ball rolling, a touch of impulsiveness, getting stuck in rather than reading/watching the tutorial first - learning on the move), a lot doesn't (excessive partying and going out, fast-paced lifestyle without thought, adrenalin junkie activities). Moreover, NT temperament fits me overall well (I'd say more aspects of NT fit me than aspects of SP). On top of that, ENTJ generally reads better than ESTP in terms of me.
Secondly, the amount of profiles I've read, and the differences in focus and emphasis between Se in socionics and Se in MBTT (e.g. Se in socionics is far more concerned with the organisational abilities of the SLE rather than in MBTT where it's more about sensory experience) have shown me that there is definitely a difference between the two types. There are traits in the SLE that fit with ENTJ better than ESTP. It has even been argued that SLEs are most like xNTJs than; more than ESTPs at least. Also, it is argued ESTPs are more like ESFPs.
To put it simply, the overall vibe I get from ENTJs is that they think too much, strategise too excessively and often do not act quickly enough. The overall vibe I get from the ESTP is that they think too little, act too impulsively and don't really strategise at all. The fact is, not only do I see myself as balanced, but this balance is something that the SLE, particularly the Ti subtype, caters for very well. It describes me more accurately than either ENTJ or ESTP.
If I can't be pinned down in MBTI, I'm inclined to think that there is something wrong with the system rather than my skills of analysis. Which is why I'm asking for your thoughts on this, your thoughts on ESTP vs ENTJ, and your general understand of socionics SLE vs ENTJ/ESTP (if you have an understanding). I'm not ruling it out that my knowledge of MBTI is a bit hazy, but I think it's more likely that MBTI describes me in one of two such ways that I just don't really like that much.