Stayed in a number of them. Pretty standard japanese "business hotel". Rooms are fairly small, internet is free, breakfast is free ($10 value).

They won't check you in early under ANY circumstances unless you pay (sometimes they want the whole day price for checking you in a couple of hours before their check-in deadline). They won't make a fuss if you come between 2 and 3 pm, but early will always be a problem.

The same applies to check out. There is NO late check out. You must be out by 10 or 11am.

And they don't care about your ChoiceHotels status whatsoever.