the zig that I borrowed was too fiddly, it was also tougher to check the alignment of the Neg stage vs the Lens stage. Lens stage to baseboard/easel was ok, but the Laser (Versalab) is just so much Cleaner in technique. Because it is easier and faster I find I'll do a quick check before a printing session and then check it as I move up or down print sizes and change easels, one of which needs a bit of shimming here and there. Checking it more often means I'll catch any errors sooner, saving time and paper.