They're stable, and they generally work. They are a better choice than hp, compaq, gateway, or ibm for PCs anyway. They are very expensive, they are too loyal to intel, and you can't do much in the way of tweaking. As far as OEM PCs from multibillion dollar companies, they are the best, which is just because they usually don't have anything onboard.
As for getting your boss a 1Ghz machine with rdram, why? An i815 is faster even according to intel, and a business PC is fine with an i752 for video. Business hardly requires an $800 1Ghz P3, a $230 800Mhz P3 is more than enough. AMD is probably out of the question due to widespread ignorance in the commecial world.