Bestmark pays in a timely manner and has nice schedulers, but is quicker to throw out a shop on a technicality than any other company I have come across.
I got burned by them many years ago on a dining assignment when my receipt had an incorrect time on it. Even though I pointed this out in the narrative and gave the correct time of day that I arrived, they refused to pay me and said that I arrived later than the available window for the shop, which was not the case.
It still irks me to this day. That was the only time I have ever been stiffed by a MSC. I'd be scared to take a shop with them this week because of the time change. I got two receipts this week that were one-hour off because the system had not been adjusted for daylight savings time.