We just had a dog-and-pony with our TAM concerning the deployment of 10 in our enterprise. Our powers-that-be aren’t ready to pull the trigger, because of the dearth of legacy applications we still support.
The migration deployment model has matured extensively from the 7-to-8 model. Anyone considering migration to 10 from 7 or 8 would do themselves a service by researching the best practices. There are a few ways to skin the cat.
Just FYI, “dearth” means “lack of” or absence of.