I am looking to buy a 4ft bar clamp for cutting sheets of plywood.

Anybody have any experience with the MLCS Boomer Red Bar Clamp?
- Is $36.95 a good price?
- Does it pay to buy the back-to-back model for $60 which is
essentially two back-to-back bar clamps, allowing you to clamp the
piece to the table?

Any other recommendations on reasonably priced quality bar clamps?

Thanks