Speed and performance is relative. It depends on a user's pc configuration, software applications, and what the user does with the computer.
I normally recommend Samsung. Tom's Hardware published the very first Samsung ssd review on 17 December 2007. Samsung has come along way since then. The 470 and the 830 are excellent ssd's. It looks like the 840 Pro will be a winner too.
I maintain the ssd data base listed in the sticky at the very top of this form section. Here is the link:
http://www.johnnylucky.org/data-storage/ssd-database.html
Scroll down to the OCZ and Samsung sections and follow the links to the technical reviews of the Vector, 840 Pro, and other other ssd you might be interested in.