People reporting sound lag in WinUAE: you have NOT followed latest progress. Toni has implemented Portaudio with ASIO support for NO DELAY AT ALL, even for professional musicians (look at EAB threads about betas and portaudio).
Chipset audio/video can be PERFECT is you DO configure WinUAE right: you can set 50HZ modes with perfect audio/video sync, smoth scroll in games WITHOUT ANY OCASSIONAL SYNC LOSS. I have tested that with Toni, you can read more in EAB.
Of course, you need a clean system (no lame A/V software or memory/CPU stealing processes in the background) and custom-defined video modes beyond the scope of this post.
So, YES, if correctly configured, WinUAE is just perfect and impossible to tell from a real Amiga. Those not knowing that fact just haven't configured it well.
The only bad part of WinUAE is being Windows based and no ports to Linux/MAC OSX for custom kernels on the host system that would allow almost instant boot-up.
Oh, and remember that you CAN load savestates on lauch, so you can totally skip loading times for ADF of WHDLoad games
