I've been using a 23CIII for about six years now and have nothing but the highest regard for it. Rigidity is simply not an issue if the enlarger has been assembled properly. My only complaint is that Beseler is rather stingy with even the smallest parts (one of my not so cheap lens boards has only one retaining screw in it although it should have three....stingy, no?). I did spend some time tweaking the focusing mechanism and made it work a lot more smoothly than it had been, but that's not difficult and instructions are available in the manual. BTW, my version is the variable contrast head. I'm sure many will tout their favorite other enlargers, but if it's in good shape, I'm confident you'll be happy with the Beseler if you choose to buy it. Good luck!