I have the Grace Inspira Imperial Frame.
Good points: the carriage rides very smooth, it has a shelf underneath for storage. It can be sized in half or the full 123 inches.
Bad points: It has a million screws and took the tech 6 hrs to put it togather, the end adjustments are plastic and easy to pull out to far, the rods are 3 inchs diameter and to big for my 9 in throat machine ( which I do not recommend as you cannot do much with it)
Be careful you really need to know alot about frames to make a good choice.