Just tested it, generally quite nice for such a new app!
I did find a few bugs/ui issues and had issues with registration where it told me the username was taken, so I tried a new one, but then when I checked my email the confirmation email was there from the initial registration attempt. The entire registration process could do with a bit of improvement, double verifying the password entered to avoid typos etc.
Straight after I registered and logged in, tapping the hamburger menu didn't work, only swiping the menu onto screen.
After, that it seems to work now. (Works after logging out and logging in again, was just buggy after my first sign in by the looks of it)
Swiping from off screen left to right to go back would be nice when browsing the forums and reading threads.
I can't add line breaks when creating a new thread, which is a pretty big issue.
You can't upload images to new new threads either yet, by the looks of it, only replies to threads?
Recent post page seems to show the thread start date, not the last post date, which feels odd. Makes it look like the most recent post on my recent post feed is from 2012
Cool though, it's showing promise. Seems very fast.