I use fluffychat daily and it works well. The issue atm is that frequently changing devices, leaving and joining a lot of rooms can disrupt the experience. If you talk mostly on the same devices and in the same rooms there is no issue as far as I can tell.
As all FOSS software it needs work and people who want to put in that work. I wont help with element and synapse since the element folks want contributors to sign away their rights which I‘m not okay with.