are they good
 

are these good discs,
they have some good and bad reviews.

http://svp.co.uk/products-solo.php?pid=1800

If they are truely TYG02 media, they're good media. But Datasafe had been using Ritek for quite a while.

Those should be legit TY media, yes. And that means they'd be good discs. The "GG" stamper code can be found in the disc hub.