One really nice upgrade i just found was the changing resolution in options. In my case with a 40" led i set it to 1600x900, and then full screen, and the next game i played was so nice, compared to all my other games in windowed 1280x800. I realise this was possible with the old client aswell, but it required a restart of the client. When i close the game it reset backs to 1280x800 and sometimes i forget to go 1600x900 and full screen, but this was all in all a very nice upgrade from the old client. Although full screen seems to generate more bugs(to me), spescficly in observing other games, or joining a custom game in custom lobby, i can click on the game i want to observe but nothing happens. Anyways, as i said i liked this feature alot, and when i remember to go full screen i appreciated the whole experience of the new client and game because in the old client it required a restart and i never bothered with it.
There's actually very few bugs that bother me with the new client but the ones that do are quite annoying. The current spectate bugs - When the game ends you dont see who won and you cant leave spectate and sometimes clicking on spectate simply doesn't work. Restart fixes those. The movement bugs - Extremely wonky 2x2 movement and you must wait until a unit finishes moving before trying to move another or you risk moving it incorrectly. Buggy global chat/no player lists - Global resets itself after games. Probably the most asked for thing in pox atm hopefully it wont take too long If those get knocked off I have virtually 0 issues with the new client.
I don't completely agree with having no issues, but these, especially the latter two, are the major usability issues for me right now.
