I think HW are a little more tried and tested, the bullistorm are pretty new to the market and have theie hicups.
Chippy what motor were you running?
Did you upgrade the software, I think that is a must.
So far I haven't had a problem with my 60A running a x12 8.5, but I havent raised all the settings to max, I think atm I would like a little more speed out of mine but a new smaller spur gear and another pinion will hopefully get what I would like.
Get the 120A if you can and upgrade the software to v3
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