We have used them for several years and haven't had many issues with reliability. There have been some occassions where they didn't show up to service a porto-potty and we had to call. They would always have some reason like bad weather, not being able to access because of locked gates, muddy roads etc. They could be more proactive in calling the customer to let them know why they didn't service and when they will be able to do it. But they are always really nice and give credits when they are at fault. They are cheaper than United. Haven't tried any other services besides porta-pottys.