As far as the trainers themselves, they still work, and collapsing sections I am not interested in is somewhat useful. (If I was able to assign trainer effects to a section for collapsing it'd be a lot more useful, of course...)
My only real gripe is a severe one, and it's the title. Before I went Beta, the title, Pro option, Play tab, and ads shared space on the trainer window.
NOW they shove it down to effectively only 80% of the screen for essentially no reason.
I use a PC to game and thus for WeMod. If I am annoyed by this on a monitor I can only imagine at the agonies a "device" gamer must suffer.