I just flew CO BusinessFirst (BF) on their reconfigured 757-200s, on a mid-con IAH-SFO during dinner time. [Edited to add: As pointed out by BJ, this is a domestic F service on BF equipment] The entire meal is served on one tray, no menu, no table cloth; however, FA service is fairly nice, cold nuts, a couple drink re-fills, and a nice ice-cream sundae. Metal knife and real salt and pepper shakers round out the offering.

The BF configuration is quite nice, similar to UA's p.s. seat, with the addition of AVOD. The best seating is row 1, with very good legroom, although nothing really compares with the spaciousness of the exit row on UA's p.s. 752's business cabin.

Here are some pictures of the F meal and BF cabin:
CO 757-200 First meal and BusinessFirst cabin

And here is the 360-degree Virtual Reality view of the first row in the BusinessFirst cabin:
CO 757-200 BF VR view