Size is the only difference I believe. With the updated makerslide I believe any “sag” or flex has been elimanted. I own the 1000mm version with the newer X axis and have never had any problems.
X-Carve 1000mm Rail Kit
X-Carve
X-Carve Core Components
X-Carve 110V DeWalt 611 Spindle and Mount
X-Carve X-Controller Kit
X-Carve NEMA 23 1000mm Motor Kit
X-Carve 1000mm Waste Board Kit
X-Carve 1000mm Drag Chain Kit
X-Carve Z-Probe
X-Carve Dust Control System
1/8" Precision Collet Kit for DeWalt 611
X-Carve Toolkit
X-Carve End Mill Starter Set
X-Carve Bit Set for Wood and Plastic
Starter Material Bundle
After IL taxes my total cost to $1890 with free shipping