I loved it and started using it a couple years back, but then I discovered a very annoying problem with it: every time an emulator gets updated, it breaks the achievement detection and then you have to wait for them to catch up to the new emu version. I had this happen twice, and sadly the second time ended with me forgetting my password for the new machine I installed the new version of my emulator (retroarch) on, and now the site won't send me a reset password request when asked, so I'm locked out of my account and cannot put it back on any emulator I have that supports it. Though honestly, I doubt I would since like I said, emulator updates kept breaking things.
Awesome idea though. I went through Dragon Quest 5 on Retroarch and got most of the achievements until an update borked it.