While using it last night I noticed my X cuts were not coming out straight, after some investigation with a straight edge I noticed the gantry is bowed in the middle towards the front ~3mm. This causes straight cuts along the X axis to be curved.
The right side of the gantry is also ~5mm further back than the left side, referenced to the end of the Y rails. This would cause rectangles, for example, to be slightly skewed, or circles to be slightly ellipsoidal.
If these are all known issues, my apologies, but I didn’t see any reference to this shortcomings on the laser cutter wiki page.