UAE integration on AROS is working great, in my opinion it is much better than AOS by far. In short, you would not even know that the app is running on an emulator, its very seamless which was the goal.
It runs just about ANY classic app seamlessly, including those that bang the hardware (Games and demos and so on). I have not found any apps that didn't work yet, and beleive me I tried many.
In short, it is a giant leap ahead for amiga fans.
Still needs more work to be finished (sound and joystick) we are starting a new bounty for this now so I think it will be assigned and completed in
the coming months.
First, sound and joystick should have been the priority there. UAE uses AHI and lowlevel for that, so there's no excuse. What's the point of integrating UAE if it can't even do basic stuff.

Now about UAE integration, there's absolutely no comparison with what you can actually do with the 68k emulation from MorphOS/OS4. What you consider as seamless and transparent with UAE is just at best an acrobatic trick, but in practice, it's very limited.
Basically, the applications running in UAE are unaware of the host OS and vice-versa, except for a few hacks. Try for instance to drag a file from wanderer to an ASL requester shown in UAE (it could work with tricks, but i doubt it does ATM). Try addressing the REXX port of a native AROS application from an application running in UAE, it will probably won't work either. And there are many many other situations that could show how limited this integration is (though it obviously depends on the implementation). And let's not even mention the different look from native and emulated apps.
Obviously, using UAE is much more compatible, when it comes to hardware-banging apps, but then MorphOS/OS4 can also deal with that with UAE, in your so-called transparent way. But at least, for games, it doesn't matter if the integration is mostly an illusion.

For instance, under MorphOS, i can just doubleclick ADFs to run my hardware-banging games, or use contextmenu to run applications/WHDLoad games in UAE (reusing an already running UAE instance if needed). And for all the other applications that don't bang the hardware (which are the majority here), i just run them directly, without this UAE handbrake.
