I have a new SB 24" and I think It's great, even though I have not used it very much, until now.
I find I am having about 4mm difference in Y axis length overall in my cut size between WYSIWG and using the laser with registration points. WYSIWG cuts to the correct size, the laser is short. I am calibrated and ensure I am dead-on when placing the laser dot.
As for using WYSIWYG, I have not found out how to move the blade in fine increments when setting up for WYSIWYG. This would be a tremendous help and speed things up considerably.
Here's where it gets even more strange. I import an svg with the cut line and reg marks. I set it to the corner of the portrait mat in SCAL, and then hide the reg marks. The cut lines are visible, and my settings cut like a charm. But it seems that 2 odd things are happening:
The left side cuts become gradually farther apart along the Y axis, compared to the right side, to where I can measure a a 2mm difference halfway down, up to 4mm difference at the bottom! I have double checked my measurements in the svg file and they are perfectly square in both illustrator and SCAL. I have also had a few right side cuts, from the exact same svg, come out angled instead of right angled on a few.
A consistent problem I have is on the right side. It will cut to a point, stop and relocate and continue cutting, and when it finishes back where it stopped, it is slightly off (like those railroad tracks that don't meet and we all scratch our heads).
I have attached photos and the svg file. Perhaps someone can give me a hand, ask questions of me and I will tell you what I can. I have quite a bit of work ahead of me soon, and I'd like to get this figured out before then. Thank you!