SSD is life.
Seriously it's been the most noticeable change I've ever made in all my time building pcs/using laptops.
There's not much negative about them other than the capacity which is almost a non-issue these days. Everything is snappier. Everything. It makes older hardware feel a bit more alive too - I've put some in a few generation old laptops and with a fresh install of windows it's like a brand new laptop (for the basic uses they get used for I mean).
The Evos are a solid unit for a good price, but there's faster out there if your motherboard can support it (m.2 or msata slots), but otherwise the Evos are tip top.
M