i used to work retail selling macs, and i always used sonnet. the tech support people know what they are doing and they tend to just plain work w/o much effort. i've installed a few and they have all been good experiences.
MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop