Long term performance is the big worry with SSDs.
Early drives delivered scorching performance out of the box, but quickly went down the pan with intensive usage. To simulate a used drive, we install Windows 7 and then stuff each SSD full of data.
This used to be enough to make SSDs suffer slow downs. More recent SSDs are much more resilient and Intel's SSDs in particular have a strong reputation for excellent longevity.
As our benchmarks show, however, it's not hugely remarkable in terms of raw performance
Synthetic drive performance, compressible data
Synthetic drive performance, incompressible data
Synthetic drive performance, 4K Random