Received my Qwas Square yesterday. Just in time to play before starting some production Monday.
It is certainly a stout piece, well made, and squares up nicely with the guide rail. One minor complaint: Qwas products should have their quality control folks check for sharp edges along the milled areas of the square. I now have a small cut on my hand where it brushed against the square. Easily fixed with a fine file, and no real harm done. Momentarily irritating, at most, but a flaw that could easily be avoided.
The square attaches easily, even without instructions. It does seem to almost seat itself into square. Very intuitive.
At first it seemed a bit cumberson to use, but I chalk most of that up to my using guide rails without any attachments for the last few years. After about a dozen cuts, the rail and square feel more natural.
I cut a couple of 36" squares from 3/4" maple ply I had around. Started with 1 fresh cut side, and continued the other 3 sides using the Qwas Square. Now, I don't have all the fancy-pants-super-duper micro measure squares that some of you guys have; but I do have one heck of a framing square, and I will declare my test cuts to be square. I also checked by measuring diagonally, and on the MFT using dogs as stops. As close to perfectly square as I ( carpenter/ cabinet maker) need to be.
As of this early writing, I have to declare the Qwas Square a success. I'm starting a run of about 20 semi-custom built-ins next week. Should be able to give it a good workout then.
Dan