I used it for a while (about 4 months) what killed it for me was emerge, I know people go on about how good it is etc, but it became such a pain, I probably didn't have everything set up properly but I had so much trouble getting stuff installed I'd have to muck around masking and unmasking packages all the time, just became such a pain to do what should have been basic installations.
The good thing though was for a long time it was the only distro that recognized my Sata raid controller, I still think the Gentoo forums are porbably the best of any linux distro I've used and it did teach me a heap.