I'm curious about your opinions and experiences. I once had one of those fretless Cort Curbow with a tiny "luthite" body (synthetic, moulded after the "real" Curbow thing) and "ebonol" fretboard - again, not wood. One of those active licensed Bart soapbars as pickup wired to a fairly noisy preamp, with the highest output I've ever experienced even with the trimmer turned all the way down. Add to the equation the fact that strings were directly in touch with the synthetic fretless fingerboard and not frets, and you can have a guess. Definitely compressed to the bone and rather cold. I expected that anyway and they never marketed them as "the sound of wood" (cit.), I just wanted to get a cheap, comfortable five string fretless and I saw that second hand for almost nothing. It was fun for a while, then I felt like I was vibrating "plastic" notes.