The RCEXL ignitions seem to be working very well, for myself in lots and lots of installations, and they have performed without complaint for many, many others.
The old standby, excellent, high quality ignitions made by CH are still available. Try
www.ch-ignitions.com
Just for my two cents worth, I don't fly anything with a magneto. I have lots of engines and quite a fleet of planes and they are all electronic ignition. No problems. I'm thinking if you have had problems you might have been using the cheaper Chinese ignitions that are not made by RCEXL. They are known to be troublesome.
Here's one source for the RCEXL ignitions and the newer RCXP ignitions:
www.rcextremepower.net
AV8TOR