Hi,

I will just offer a few comments for general info.
I think when Liquid fuel start becomes more widespread, it will be very popular. Simplicity is always a plus. Lubrication to the bearings is a pretty nice plus.
I have been flying several Sophia 850's for abou 4-5 years now (they are not marketed any more). This engine does not require propane or butane to start. It starts on liquid fuel which is a mix of about 70% kero and 30% coleman (white gas). It uses a separate computer drive oil pump that make sure the bearings are very well lubricated at startup, and shut down.
The starts are fine, and the temps stay low. It does not have the tendency to get 'gas soaked' on missed starts that propane does. I have done very carefree handling with the engine, and have never done damage to a tailpipe, so it seems easier on those parts. The engine does not have a factory electric starter, but we have used one a lot, and it works well.

All of that said, I also have a Jetcat P-120 which has been awesome, so until new electric/kero start engines become more popular/proven, that is what I would reccomend. The BMT sounds interesting.

Regards,
David