We have stayed at Ameristar numerous times and always enjoy their nice rooms and comfortable beds. Lately we have been staying at a competitor more often because Ameristar seems to have become...hmmm...well stingier with their comped rooms. When traveling to Kansas City about every other month we will book where we can get a comped room, and of course play there as well.
However, as of late, Ameristar casino seems to have a better payout in their casino and we love their variety and up-to-date slots. Every time we come there are new slot machines to play.
The attached arcade and movie theater are a bonus and their large buffet is always a nice treat as well.