Wow, there are a lot of old school guys here. Good gas engines (Electronic ignition, with auto advance) are far far more realiable, easer to start, better idle, smoother midrange, and longer lasting than any glow or maginito engine. Most of these engines have a life span at least 5 times that of a glow engine. They are much easer to start than a glow or maginito engine (will not kick back, and will easely hand start and you dont need a big spring, or have to wack or slap the prop)

Here is an example:

Brison 3.2, five years, 30+ gallons:
Dead sticks = 0
Hard starts = 0
replaced spark plug= 0
Adjusted needles = 0
Changed the switch = never
Replaced the ign battery once just because I thought it was getting old

Saito 180, 3 years about five gallons
Dead sticks 5-7
Hard starts, not with the starter, however kicked back several times throwing the prop, wasn't hurt
Replaced glow plug 3 or 4 times with type F
Adjusted needels 4 or 5 times a year
replaced berings once

ST 140, 5 years, 4 or 5 gallons
Dead sticks = too many to count
Hard starts, never
Adjust needles = every day of flight
Replaced carb & added fuel pump trying to get fewer dead sticks.
Replaced glow plugs= many, many times.

US 41, less than two gallons, sold
Hard starts, every time
Broken spring starter
no dead sticks
no needle adjustments