I spoke with ATR about this a couple months ago. They are nearing release. The first release will be 2", followed by 1",1/2"... So there is still some time to wait.
I testing a new reel of RMG 900 today on my ATR-102 1/2". The first Reel I bought had problems with shedding and leaving deposits on the heads. In the mean time, I used some EMTEC 900, which performed and sounded awesome- better than GP9 or 499.
I contacted RMG and they quickly replaced the reels, sending me new tape cakes, claiming that I had received an older bad batch.
Hopefully the new RMGI is just like this stuff the emtec.
You should email RMGI in Europe, and find the best place to buy a good new batch. SET up according to their specs and try it. Later you can try a reel of the ATR stuff when it is available. Chasing down a steady supply of quantegy may be a challenge, and i would avoid the sound of GP9.