From my own experience the aftermarket coils seem to only work on the non easystart saws. The oem coils have a different ignition internal setup and these are matched to the flywheel, so a coil from a easytart saw will not work on a non easystart saw and vice versa. When looking for coils there have been a few updates / upgrades making looking for early part numbers also a little troublesome. Again the colour depended on the upgrade as well just to make it more of a pain. Switching from easystart to non easystart makes getting coils simplr. The Chinese coils I used have been ok so far.
I really like the 3500/3501/4300 saws, especially the German built ones, inboard clutch, adj oiler, mag/ alloy crankcases, spring AV, remove any cats and the limiters and the always start and cut well. I try to use a slightly larger radius bar nose if possible as the low kickback small nose bars seem to pick up wood between the chain and bar and jam up or throw chains when used for limbing, brushing, hedging etc. The older 340-400 series are very light and run well after a simple muffler mod, lots around 9 at least in Europe) so no problem for parts saws, rubber AV but as a small saw don't vibrate much.
