yo, I've never bought that product but have tried other similar ones when I 1st got started on the net, and NO there not worth it...
they will screwup your system putting everything on fast forward even your clock ,settings etc....
If U really wanna speed it up try system mechanics pro...
http://www.iolo.com/sm/ads/landing/5...5-F880DD92137D
and tweek your shit to the max with it, but be really careful when you use it...
U may also want to add more RAM and take other steps to optimize your machine, just do a lil research & get the job done right