Pros
Good benefits, decent mobility if you want to move internally, pays better than most companies around Boise. You can succeed if you work many hours and play politics well. Some people fit well, some don't, so take it with a grain of salt.
Cons
The usual big tech company fare: pointless meetings, BS politics, evening calls (read: bad work/life balance), lack of willingness to promote people in order to keep the balance sheet looking good, performance reviews that may lead to firing, seducing new college grads to join on cheap while pushing out the older, expensive folks, providing more jobs overseas for cheaper labor instead of domestic. Micron's new leadership wants the company to follow the Silicon Valley model, which is great if you're in California with lots of tech jobs available. Boise, not so much. Micron is basically Sandisk now with all of the new leadership in place.