I'm running a megajolt / EDIS distributorless system, and I love it
I had a pulsar dizzy for a couple of years and it was good, but nothing like how smooth the megajolt is, and the other day running my new motor in, I thought it lacked a bit of poke so loaded up a different map, "there ya go, more grunt". Next is to put it on the dyno and tweak the map to give the most power at all loads & rpm
I'm also running a .040" plug gap, after changing the plugs I took about 1/2 a turn out of each carb's mixture adjustment, so is cheaper on fuel too
total cost was less than $300, I got all the info I needed from here (Ben aka 92, and pristic) and did all the work myself - aside from getting the trigger wheel laser cut
I suppose the 123 is the easiest 'drop it in and go', the Aldon ones don't get a lot of airplay in Australia - they seem expensive, and there are other options like the electronic module to go in your standard dizzy - I'd rather not have a dizzy at all
I put a welsh plug in my distributor drive hole - plugged that sucker up for good 
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did I tell you that I won a
trophy?