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I have the AM5 and it has been the best investment in gear I have made. As AdamJL pointed out above, if you're going to go down the strain wave route, go all the way. Having a mount that doesn't require counterweights, nor balancing, means i can leave it setup, and just need to plonk it out in the yard and align it to get imaging. I can be setup and ready to image in well under 10 minutes.
having a system with minimal setup time, means that i am using it more. My current imaging train is about 10kg, and i'm routinely seeing around 0.5" RMS in my guiding.
I haven't encountered or tested any of the power failure scenarios mentioned above, so i can't comment on that. But be mindful that a SW gear mount doesn't have clutches, so if your equipment makes contact with your tripod or pier, it will keep driving until something gives way, or it cuts power on motor overload.
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