The speeds for the ADATA SU800 (1TB) 3D Nand SSD are good. It's a fast SSD that's good for general work loads and gaming without breaking the bank. Easy to install - had no issues installing, recognizing or formatting. There may be better SSD's, but you'll likely spend a lot more. For most gamers & general PC users, this SSD is perfect.
My first SU800 died after 3-4 months, but ADATA issued me a new one via the RMA process. ADATA's return process took about 2 weeks total, including shipping to and from; not a very fast process, but not slow either. (Most of the time was spent in delivery.) I've waited much longer for replaced products from other companies.
So far, this new one is rocking along pretty well. I hope the failed SSD was a fluke and this one lasts much longer. Time will tell and I'll update this review if necessary. As it is, I'm very pleased with this SSD and ADATA's support/warranty process.