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As it is cloudy today, I'm limited to physical measurements.
All are as equipped to use in a 2" focuser, and with a Canon EF mount.
William Optics x0.8 Flattener III
Weight: 302g
Length: 76.5mm
Width: 77.8mm
Clear Aperture: 38.7mm
Cost (US Dollars): $257 + lens mount
William Optics Variable Flattener 4
Weight: 643g
Length: 157.5mm
Width: 84.8mm
Clear Aperture: 38.7mm
Cost (US Dollars): $300 + lens mount
Borg Oasis Reducer 0.85x DG-L (7887):
Weight: 173g
Length: 82.0mm
Width: 65.2mm
Clear Aperture: 46.9mm
Cost (US Dollars): $349 + lens mount ($23, #5005 for Canon EF) + 2" focuser tube (39, #7425)
All specs are as measured by me and not necessarily those stated by the manufacturer.
In the attached image, the Borg is on the left, the Flattener 4 in the middle, and the Flattener 3 is on the right.
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