Crucial is a division of Micron, so I'd be amazed if they aren't using Micron chips.... I bought some Corsair PC2400 recently, works great in my Dragon plus. The people at Fry's (yeah, I know!) showed me an internal memo advising against Mushkin on any Via board due to incompatibilities, but OK for AMD/SIS chipsets .
Micron (MT) RAM chips are used on lots of generic memory, the quality of the PCB and manufacturing process is the issue. With Corsair/Crucial/Mushkin you know you are getting quality RAM chips on a quality PCB, that is not true with all RAM bearing Micron Techology chips. I've used generic stuff and it mostly works OK, but the price difference is not that great on a nice system that I would want to screw around with system instability due to crappy RAM, there's enough other things that can give you headaches without looking for trouble.