.I just bought a JF frame this summer,for 3 reasons. 1) I do not have the space for a standing frame. 2) I cannot bend over to pin the sandwich together. 3) Spray basting takes space also, or a least a wall.
I had DH buy metal rollers 6' long for my 55x66 QoV size quilts. Then you need an 8' table top. DH also fitted an 8'x2' sheet of insulating foam with wooden trim screwed to ends to prevent roll-off. This sits atop a 5' table.
You do need at least 10' of space total to manuever the frame , using the 6'poles.
I just completed my 3rd quilt. It does take practise, just like anyother form of quilting. I use a Juki machine, which has a 9" harp area, which is a little larger than a domestic sew machine.
I definetly would like a long arm, but price and space considerations ruled that out. The JF is a compromise that is working for me. :D