I haven't seen the m902, but I have had the 901 for just over a year now. From what I gather, the D/A has been improved, but the analog headphone amp section is very similar (if not the same??). That said, I absolutely love my 901, and I say go for it, get the m902. I've briefly thought about selling the 901 and buying an m902, but at this point, I don't think I need to do it just yet.