bbc,
I am listening right now to the songs posted on the site you mentioned: I am glad that there are finally MP3s of the G 70 made by "one of us": in other words different from the usual demo's made by Roland or other manufacturers!

Speaking of sounds, the ones I liked most were the organs, the alto sax and the french musette (almost unbelievable!) On a critical note, the recording level was at times too high (there was a lot of distortion especially on the bass in songs like "Samba pa ti", and even on the piano in the song named "Piano 2" and in "Clair de Lune"). Aside from that, I have to say that maybe were right those people who wrote that the G 70 overall sound is "drowned" in reverb, with an unpleasant effect on the "presence", because the sound seems always too distant. This is especially evident in songs like "Brazilia" (where even the drums are awash in reverb), or "The Entertainer" (listen to the piano and you will realize what I mean: it seems like it is playing in an empty hall the size of a tennis court!)
Speaking from a musical point of view, I have to congratulate your friend for the way he plays: he is really a good player, and this is especially apparent in the piano pieces.
Thank you for giving us this link!