I'm an INTP 4w5, which I guess is an odd combination. I probably seem like an INTP on the outside, but feel like a 4w5 on the inside. My INTP-ness, as well as being Sx-last, serves to temper the 4's drama, and as a result, I don't seem to have any of that stereotypical melodrama and expressiveness of a 4. But at the same time, I can be very sentimental, and I'm drawn to emotional intensity, especially in music and films. I also like an artistic output, and often find myself treating clothing as a form of self-expression. I dress to match my specific mood, as well as to show the world who I am. Because of this and my hidden sentimentality, I often seem like an INFP.
I don't think this combination causes problems for me. I like being an oddball--I get to be unique. I also feel like I get the best of both worlds--logic and emotionality. But I guess there is one downside, and it's that I'm restricted in my ability to express my emotions compared with most 4's.