I have done a few hotel shops for ACL, and have done many restaurants. I also edited for them years ago and did a few other various ad hoc projects for them. ACL is not a company that will look for a way to not pay you. If anything they will look for every way to help you.
Their hotels are not the reversal kind. You will pay for it and then receive a check for the amount. Your check is sent out on the 20th of the month following the month in which you do the shop. Like clockwork.
I consider the guys at ACL friends as well as clients, and there are VERY few companies I can say that about. While you are not going to get rich doing their shops, and their hotel shops tend to be at a fairly low price point (mid-range to low/mid range), they are good people.