Just now I'm using Datasafe and they are ok. Infiniti are good, Tescos own brand worked fine for me but a friend had problems with them.
I think a lot depends on the writer. Maybe I'm lucky but my writer appear to work with everything.
Only thing I did notice with Datasafe was they are rated as 16x but if I burn at 16x they fail, drop burning speed to 8x and they are fine. The only ones I have had so far that said they were 16x and burned at this speed was Infiniti Samurai. Therefore I conclude the Infiniti ones are better quality.
They may be fine but I wouldn't store important information on them, I'm not saying they're bad, just that the ink used in them may not stand up to a lot of repeat use. I use Datawrite Titanium 8x a lot which some people don't like and I haven't had one fail yet, If I need to store impotant information however then I will only use Taiyo Yuden disks or disks that use that type of ink as, from what I've read they seem to be the best.