Very fast, I am getting approximately 900-1000mbs read speeds on 2 of these in raid 1; I love the extended life (writes) on these units, 3.6 PB

none so far, I have to this date not had a single Intel SSD need rma; I believe they are the most reliable

Using this as a SLOG with FreeNAS and it gets north of 100MB/s worth of synchronous writes. Great drive.