Unless Piston AOE is corrected,gears are shimmed well,has a mosfet and good shock absorption on the front of the shell it isn't long term reliable on an 11.1v lipo.
It will either eat it's piston or fry it's trigger contacts.
On the bushings v Bearings debate- Bearings are good if they are over 8mm in diameter so they can hander higher loads. They are also best placed on the sector and bevel gear since load is more-or-less equally divided on the two sides. Spur gear should have bushings since most of the load is shifted to one side. Bushings are harder to fuck up for manufacturers too,so lemons are much less common.
Retailer is just trying to make a sell. Low end Chinese guns have been coming with neodymium high torque motors and some of the strongest stock steel gears about since 2008 or so,that's the 'standard' really for a gun tbh. I don't think anyone other than Marui uses non steel gears and even then TM only make Zinc sector gears,the others are just a weak alloy.