Compare as RH10 and NH1, it depend on your require : 1. Sound Compare as NH1, RH10 only use the Normal Version of Digital Amp by New Japan Radio, and NH1 use the High Definded Digital Amp by Sony. As New Japan Radio Product also provide good PWM conv but this chip don't support Line Out, i can not listen different between NH1 and RH10 by using ER4P directly. 2. Case, it a plastic case with metal support, the NH1 is metal. 3. RH10 provide only Hi-MD mode record, you don't select record a normal MD disc by RH10 directly (You can record normal MD and Net-MD Mode by SS via computer) 4. If you playback direct by mp3, this can provide better sound quality that NH1, but the mp3 playback is worst that ATRAC3Plus, so that normal use ATRAC3Plus. I thing Mp3 function is plus but not the main point of select MD