Ultrashape uses focused ultrasound energy to vibrate water cells, causing fat cells to lyse (implode) where the body can process the fat, permanently removing fat in the treated areas. Because it is non-thermal, very little inflammation or swelling occurs, thus less discomfort.Sculpsure heats the fat cells selectively, but less so than Ultrashape, to cause fat cell destruction, then causing the body to process it as well. Like other cold or heat-based therapies, it can be less uncomfortable after your skin and body adjusts to the temperature, but the discomfort after the treatments can be mildly to moderately uncomfortable. Both these devices causes similar reduction in circumference. However, it will never compare to liposuction in terms of dramatic fat reduction. Nonetheless, these devices can be nice options if you want much less downtime, no surgery, and less discomfort.