I vote for the "wireless" glow plug ignitor. The wires in the prop issue is the primary reason.

I have also learned that when I use my electric starter, the glow driver circuitry in my Hanger 9 power panel compensates for the current drain of the starter by turning up the drive frequency, unfortunately, it doesn't turn the frequency back down fast enough when the starter motor switches off. This of course, fries the plug.

I balance my props on the shaft of a screwdriver at the hobby shop. If they don't pass the screwdriver balance test at the hobby shop, I reject the prop. I do not believe that at our small scale, we can really balance very accurately. In trying to do so, I suspect that we mess up the dynamic balance of the prop. Our propellors are part of a dynamic system, and like balancing the tires on your car, static balancing is not much use.

For .60 sized models and larger, balance is very inportant, but for the 40 sized and smaller models, I think a propellor must be WAY out of balance before it makes any discernable difference in performance, wear or reliability.