I have the Grace EZ3 frame. My dh gave it to me for Mother's Day 2 years ago. I have yet to complete a quilt on it.
Here is why:
This frame, when set up to hold a queen size quilt, is 100 inches wide by approx 40 inches deep. That is the entire length of my sewing room and half the width. You can fold this frame and "store" the quilt on it, I don't find that to be practical as I don't have vaulted ceilings and would have to lean it at a slant.
I also find the loading process confusing. What I thought would be very simple is quite complex and time consuming.
I use an oval frame on a stand that can be purchased for $50. The stand tilts. It takes up little room. The quilt has to rest on the floor, and the quilt has to be basted. Even though it is more work (to baste), I like this method best.
I will not sell my Grace frame as it was a gift from my dh. I will not use it though, because of the above reasons.