I have just ordered some Minox film from them, they were very quick and helpful online, haven't received the film yet but I get a good vibe. The optical printing sounds good, will also be interested in anyone's experience with that.
When I was in the lab business, Mitsubishi was always a cheaper alternative to Kodak and Fuji, they are a big player, especially in Japan, and I can see no reason why the paper wouldn't be good.