For my workbench project I needed to cut sheet goods on the length, and I wanted the cuts to be straight since I’m going to be looking at ’em for awhile. I found Swanson’s CG100 cutting guide at Lowe’s for $20 and figured it was worth a shot.
When I got it home I found that the pieces were wrapped together at one end by about a quarter-mile of scotch tape that must’ve fused together in some storage facility — but once I got the tape off the unit went together easily enough. It consists of two 50″ aluminum strips, a dovetail “wedge” that joins the two pieces with set screws, and a pair of C-clamps that’re about three inches.
The aluminum guide measures only about 1/4″ tall and two inches wide, so if your circular saw pushes toward the guide, it can work its way under it. The guide worked well enough, but at the full 100” length I had to be very careful in the middle of the cut — using it at the 50″ length would’ve been better. The clamps are pretty much useless unless you’re just clamping the rail to sheet goods, but my sheet had a workbench under it so I had to use some bar clamps.
Overall it works well for the price, but in retrospect I wish I’d bought a higher-end cutting guide, or just bought a 10′ length of 2x stock and ran it though the jointer for a straightedge.