My frame is a homemade one. I bought it at an auction in NC because it was so similar to the one my DH's family used. I don't know much about the commercial ones. I love my frame but there are some things you have to get used to when sewing on one. You have to develop ways to quilt in all directions. When you quilt on a hoop or in your lap you can turn the quilt. When a quilt is on the frame you have to do the turning. I also have back problems so I have to quilt only a couple of hours at a time. I've found that using a chair that can be lowered or raised helps me a lot. What I love the most about using my frame is that you never have to worry about any tucks or puckers. The rollers keep the layers smooth .... no wrinkles to worry about.
The picture is from several years ago when I was quilting my DGS's graduation quilt.