I have two of my friends using the "X" version of the Hydros BC since it came out 21/22. They love it and had nothing but good things to say about it. Their BC's are holding up very nicely too. These two friends are very active divers, they own their own boats and dive 2 -3 days a week during the dive season, May - November. The BC is stable on surface and underwater. The two friends appear to have good trim u/w also. They don't feel any restriction or any pressure on their body because of this BC. One of them used to dive a BP/W BC which he stopped using since he got his Hydros X BC. At least one of them, can't remember if both but I know that one of them, has all the accessories including a dive knife attached to the BC.
At the end, everything they related to me is very positive with no complaints at all. It is something that will last you for a very long time and will take the abuse of teaching and being a dive leader and active diver.