I dont think it needs to be that technical. i trued mine on a belt sander. it wouldnt hurt though. kind of hard to chuck up as the backplate is kind of tapered.

Honestly I really dont know. I do like how the rcexl has a metal case instead of the plastic one the xyz has. the palstic case on mine came apart and i had to glue it all back together. It has two screw mounting holes and i think the engine vibration killed it in about 20 min of flight time. that coupled with the gas soaking was the demise of mine. I think any one you get i would wrap it in foam and let it free float to reduce vibration. for the 10 bucks more does it come with the sensor also?

I really dont know which one is better. What i can tell you the reason i purchased mine was to see if there was some power to be gained by not having the rotational wieght of the flywheel and if the stock magneto magnetic drag had any affect on power. I found that there was absolutly no gain to be had as far as power out put. a stock mag would produce just as much as the electronic. the only advantage i found is it had a better idle quality and was much easier to start. other than that i think it overcomplicates things with another battery, sensor and a ignition that has to be timmed and on and on. I am not going to use this and will stick with the stock ignition as it produces just as much power and in my opinion and this is just my opinion is far more reliable than the electronic ignition as there is just far less to go wrong. the weight savings just isnt enough to be a concern. granted you are losing the flywheel and coil but you must add back in the box and all the works ie sensor, and a fairly large battery. so the weight savings really isnt much