Anyone tried these and are they any good?

Well they work if thats any help, Princo dye same as datawrite yellows but 4x. Not as good as ritek though.

I know of several traders who have ditched ritek in favour of these.Price maybe a factor of course.4x media has industry standards from the dvd forum made up of the likes of pioneer etc hence if you stick in a 4x disc in your writer it will read it alot quicker than a 1x or 2x disc as they had no standard.No one can comment on on the longetivity of the disc e.g. what it will be like months down the line to read from but technically there are certain standards laid down by the forum that have to be met for 4x media.
These are alot cheaper than riteks so a good buy.I have ordered some riteks are too pricey just now and I have seen nothing but excellent reviews for the ice 4x.