Please refer to this thread for more information about the new V Air Compressor.
http://www.chiefdelphi.com/forums/sh...ght=compressor
If you are talking about the new Thomas 215 than the V Air is about half a pound lighter but the Thomas is leaps and bounds better in terms of reliability, cycle time, and running temperature.
If you are talking about the old Thomas that were given in the KOP than the weight difference is about half.