Re: Tegile and Nimble aren't "really" AFAs: they were hybrids like Infinidat until recently
Compellent has been doing the hybrid thing since 2003, with fast performance tiers and cheaper capacity tiers. Jump forward to the flash era and the compellent adapted very easily to this architecture, with flash and large capacity disk.
Dell bought Compellent. The product is now the SC series and according to the specs, this scales up to 3PB, has dedup, compression, block and file - and really good support.
In comparing the two, I don't see Infinidat as anything special or unique.