I didn't think another company made any commercial airline sims.  I didn't see any on their website.  Are you sure it is another company?

By the way I would definately purchase a Captain Sim 737-200 made like the 757 Block F.  Captain Sim's approach on building these sims is very unique, realistic and fun to fly.  I just can't say enough about my 757-200/300 Block F.
I do have some 737s that I really enjoy flying, but Captain Sim looks to make everything function in some way throughout the aircraft, not stopping at an extensive and realistic flightdeck and it is really awesome how he builds them.
The way I feel, if I have any interest in the real airplane, I will definitely buy Captain Sim's version of it. 8-) <----Captain Sim