We recently got this booster and we love it! We were using a travel high chair, but the hard plastic was damaging our leather chairs, and this was the perfect answer. She is way more comfy in it and it is not cumbersome to move around. There is no safety strap to secure it to the chair, so it is for older toddlers that can sit (fairly) still. Visit Baby Smart USA for more info and where you can buy it. We picked ours up at Babies R Us. At $36 it is not cheap, but we figure we will get a lot of use out of it.
Love my cushee booster! At about 15 mo we ditched the high chair and opted for this! Cant live without it–my mom and mother in law also invested in one!