Just looking for a subjective opinion. If the grass fuses to the underside and requires scraping to get it off, well that’s a result.
If it just blows off with a leaf blower that’s a pretty good indication as well. 
I have a hair brained idea on converting my old mower into some kind of pine cone/ small debris colector!
But thats down the road a bit
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I’v been running my Pro Head for a couple of weeks now. Had an issue where the battery wouldn’t charge much above 60%.
I just took it off of the wireless charger and plugged in the power cord and forced the system to charge to 100%. Hasn’t been a problem since.
Im really impresses with how capable this little head is. It was hacking 6-8”+ grass down without a problem.
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That’s a known issue right now. Unplugging battery for 4 hours will solve it for now, if it happens again.