These are a fantastic option for drive in ants and beetles. I swapped to these from the brushed motors FingerTech sells and am never going back. Only problem is that, at least for me, the gearbox screws ALWAYS back out, even when I smother them in threadlocker. It might just be a me thing however, so be aware of that.
[FTR- Loctite won't cure properly because of the grease inside the holes. Grab some Vibra-Tite VC-3 and apply that to clean screws. That'll keep things tight!]

These motors are incredible. I was using pololu motors and then the botkits motors you offer on this site but these are on another level. So much faster and lighter too!

These gearboxes are extremely high quality and the output shaft is AMAZING as compared to the competition.. I used "mercury boxes" before this and the shipping times are HORRIBLE, 3-6 months sometimes if you even get it. And the shafts on those are such a soft steel that just tightening a flat head set screw "mares" the shaft making the hub almost impossible to remove and bending extremely easily. These mega sparks shaft is WAY higher quality just by looking at them and even CRANKING down the set screw and doing about 20 min of full throttle driving in my test box today after installing the new gears, and the shafts had 0 marks on it from the set screw and the hub came right off! Super awesome and thank you again.