I have tried it, and find the save state very reliable. I immeadiately tested games that have a difficult history of saving, like Megalomania, Powermonger and Pirates..oh, and Cadaver series as well...perfection. Sweet and simple. This is without a doubt the most important development lately. Now I can save King of Chicago and return to play where I have to make a hit on the rival gang's hideout
I must state that the save files are HUGE..over 11 megabytes each.
Next on my wish list..a WinUAE without that absolutely useless JIT garbage.