Haven't tried Ricoh ('cos I can't find them!) but I've burnt about 30 Ritek G04's on my 106D with no problems at all. As I want loose (spindle), plain white printable discs, my only available choices so far (excluding known crap brands) have been Ritek and Princo A's, both of which work fine. Only complaint - I wish the coating on the Riteks extended further into the hub. Still, if that's their only fault I can live with it.