I suppose then that these experiences prove that any personal recommendation is useless and you should try whatever, yourself.
Couldn't agree more!
I had the autocom for years and was quite happy with it although I did have to replace the leads occasionally. Last year when I got the new WC GS complete with Nav 5, I had the choice of transferring the autocom across and getting the BT module for it or just ditch it and go completely BT.
In the end I went with the Sena SMH10. In the 16 months since, it has been faultless. I haven't experienced the water ingress problems that others have described despite being through very heavy down-pours for days on end. I have noticed that my unit doesn't last as long on battery as the Mrs unit. I suspect because mine gets used on a daily basis whilst the Mrs unit only get used occasionally. So far, not a big problem. I guess I get about 7 hours continuous use out of mine and I can charge it while riding. If it gets really bad at holding a charge, I'll look at changing the battery.
The other advantage is that because it isn't tied to the bike, I don't have to have separate units for each bike.
A couple of months ago I tried the 20S but sent the units back. To me they weren't any better than the SMH10 and the volume was definitely lower.