My exH and i went. We were on a low income so they charged £10 per session, but did make us feel bad about that and reminded us they were massively discounting it and couldn't do it indefinitely.
We had sex issues, exH couldn't get or maintain an erection. We went to a sex counsellor first who was awful. She seemed completely out of her depth when the 'script' didn't work. Ie we did all the touching and kissing exercises but it still didn't work so she seemed to get angry - as if, if we were doing it properly it would have worked. Eventually she seemed to get desperate and started recommending things which neither of us was comfortable with (ie the main problem was ex could only get it up if i was dressed up in sexy undies and on all 4s etc - so she said why didn't i just do that every time i wanted sex, problem solved! Umm, that's the reason we went there - so i DIDN"T have to do that!).
We then got passed on to a relationship therapist, who was much better and pretty much diagnosed the problem. We were best friends and not lovers. There was no sexual spark. We got on great, had no issues, never rowed, but were enmeshed like brother and sister.
Nothing would change, so they asked us to stop going as really there was no actual problem to fix. We ignored them and stayed together for 5 more years, then got married, year later we were getting divorced. :(
Good luck OP