Sorry but they are garbage in my experience. They are either so tight that it's a pain to take them out with slippery hands or too loose. More importantly, looking down to put the bottle back in place just doesn't work for me.
They'd be ok on a commuter or when riding casually but if you're doing any hard effort and wanna quickly get a sip and put the bottle back in place, I gotta say a big pass on these.
It's a pity cause I LOVED the idea on paper. I just hated them in practice and couldn't take them off the bike fast enough to go back to my good old tacx cages.