Have SSDs going back to Intels G1 (generation 1), and outside of maybe a meaninless bench mark program - NO noticable drop in performance.
.. Just make sure you treat it as it should be treated, trim enabled and a Min of 15% free space ( I prefer 20 %) this is so wear leving, GC and Trim can work there magic.
Even a with some deteration, it is still going to be Very much faster than a HDD, say 5 years out.
As chainsaw pointed out anadtech has some very good reviews that normally include "hammering" the drive to verify the effectiveness of GC and tirm in terms of returning the drive to "manufs" specs.
HDDs also has a deteration - Normally this is sectors going bad. Ling run this is worse.