They work pretty well, I'm looking for more ways to hang up and secure them. I'm in an apartment so can't really do much for hard installs but have secured them with harbor freight clamps and ratchet straps, cheap d-links from just anywhere.
As far as the tubes themselves go the fit and finish is more than acceptable.
Their performance is good too the progression of resistance is good but less steep than a circle band.
The rated resistance seems to be more of a max than average, not judging it though.
Not for certain from ring to ring they seem to be about 56" end to end, meaning wherever you put them up + handles if you're using, the ends are kinda like a standard single straight rope anyway + fitment+ taking up a little slack+ your RoM means you do kinda need a decent amount of space.
I have a pair of 60's and 40's might pick up some 20's or 30s as well soon.