I don't know about their server components...
...as we don't touch them here at work.
Their desktop units are a joy to work with. Simple access to the case internals, easy removal of everything with extra mounting brackets, etc.
I wouldn't use one as a home machine (sucky hardware for Real Men) but for an office space? The standardization of equipment is great. We've also had excellent reliability AND service from them - we say jump, they ask how high on the way down.
I also don't know how much that's costing us, though...
And though you hold the keys to ruin of everything I see/With every prison blown to dust, my enemies walk free/Though all the kingdoms turn to sand and fall into the sea/ I'm mad about you I'm mad about you