I bought a dizzy with a vacuum advance and one of these at Valla last year from Gary at Wolfsbugh Automotive, as well as a spare electronic ignition. I had run Compufires in a 009 for 10 or 15 years and had a pretty good run - I think I had 2 fail in that time.
I installed the distributor a week or so after Valla and found it was great - the vacuum advance (replacing a 009) gave me a lot more low speed torque, great for towing my trailer. In November, I started getting a miss - it wasn't speed or power related, just random - it would even miss a few when idling, almost stop, then carry on again.
I fitted the spare electronic module - problem fixed. Then in February, while doing a job out of town, I was on my way home and the motor suddenly started missing like anything. I checked everything, and the centre electrode of the dizzy cap seemed burnt, so I replaced the cap, and I was away. The problem re-appeared a few times over the next few days, mainly if I got the revs up a bit - noticed it around town, but cruising at low revs on country roads, it was OK. If I stopped and let it cool down for 20 mins or half an hour, it would go again.
I put points and condenser back in, and no more problem since. Maybe I had 2 dodgy electronic units out of a bad batch?
I do think it generally runs smoother with electronic ignition, and certainly less problems in wet weather, so I am watching this thread with interest to see what one to get next.