I have been flying a Hacker A20-34S in my shock flyer extra with an 8x3.8 prop on a 2S-720TP Gen2 pack and the performance is spectacular. The 30M is over kill for this model especially if you’re flying in doors. As for the price Hacker A20S 59.99 and A20M 64.99 with 2 motor mounts, 2 prop adapters, and all hardware. They are also available with ESC’s for 89.99 and 99.99. The AXI is 65.90 and another 12.90 for the mount. If you throw in there ESC the price is 134.90. One last thing is the Hacker weighs less A20S 1.02oz, A20M1.48oz, and the AXI 1.6oz.