Bang for buck these are one of the best conversions around, and its not just me that says so. The Maxi never really took of as a glow but converted over to gas, it definitely gives good value. This is the first one i have converted, i have 4 more waiting!!
The head button could really do with being re-machined but that's all. However this is only necessary on the 10mm and up plugs. If you stay with the glow size spark plugs....no need.
Good oil is not available here so Shell Advance SX 2 mineral oil is used at 40/1. It seems to work just fine. Cooling should be fine but with the tropical temperatures here, i never tune for max power. I always run a fair bit rich to help keep things cool....er!! Again, this approach seems to work just fine on my other glow and gas engines.