I have been playing piano for well over ten years. (wow, don't I feel old...)
I don't have a good idea of how well I can play though. 

 I can play pretty much whatever I like without too much frustration. (unless it involves 6 flats plus accidentals...) So I can't play like a CD (I've had no concert piano training) but I can play pretty decently. 

 Good enough to teach, anyhow. 
 
 My favorite composers are Debussy, Ravel, and Chopin. Plus random. ;D Rachmanninoff and Shostakovitch are cool but they don't really do much piano (and their music is harder to find because it's more modern) Oh yeah, and I like John Williams and Howard Shore when I can afford to buy the piano transcriptions. 

 (I also like some neoclassical/newage composers but haven't been able to get any sheet music for that) 
I can play Chopin, yes. I like preludes (Raindrop esp.) and Polonaises (can't remember title) and the Funeral March. 

 I also like the books I have of arrangements of classical + carols or hymns, including a strong dose of Chopin... and some pieces in those books that I haven't been able to find anyplace else like some etudes. 
 
 Oh yeah, Nocturnes... I can play some, but there is one that I haven't practiced but my mom can play so well.... someday I'll get to it. 
 
 Where was this derailed from? I hadn't heard any piano-talk anyplace. ;D (not that I read every thread... goodness, I don't have time for that. ;D)