I've not had a problem meeting the Diamond requirements (60 nights or 30 stays); however, Diamond Reserve (80 nights or 40 stays and $18,000 spend) is above and beyond what I can achieve. With the reduced Diamond qualification requirements, I'm likely to move nights after 42 over to Marriott. I might be more likely to stick with Hilton if they offered night and stay credit for holding one of their credit cards- I hold the Surpass Amex.