Same experience with my Tigermoth, this was with the "old formula" though, the new stuff doesn't seem to have as strong an adhesive so I've helped it along with some nitrate dope on my Waco.

Yeah, you can't beat the "pup pup" of a 4-stroke, or the puff of smoke as you throttle up.[8D]

I do like the cleanup of electrics though. And as for cost, once you add in the cost of glow plugs and fuel over a couple seasons, electrics begin to look downright economical, at least when compared to 4-strokes. Of course that depends what size you're going to. For economy Gas (petrol) has the upper hand by a long stretch.