Rob,
I have used the Pazon twin plug on a single in several races and it worked fine. If you plan to get a twin plug then it is a fine system. You should consider strobing the ignition to verify its readings and buying dyno time to set the timing properly the first time. If you are using a single plug ignition, then just set it as usual and I might consider strobing it once just for peace of mind. However, for a single plug ignition, I agree with John. Get another stock system, magneto or coil and put it on. Rebuild the mag and put it on the shelf. You should be set for life. If there are problems with a stock system there are many more solutions than are available for the electronic systems and most owners are much more familiar with stock systems if problems arise.
I purchased directly from Pazon in 2008 and the price seemed reasonable. Maybe the dollar has changed significantly, but the price now is 70% higher.
I installed it on my racer and the coil unit is small. I mounted the ECU under the seat where it would be away from the heat. All of this was easy on a racer, but I think it might be a little bit more difficult on a stock bike.
As I remember, timing was easy. I did not strobe it to check. It takes some careful checking to make certain that the technique that you are using is producing the resulting ingnition setting that you wish. I have found that the ignition setting can vary wildy based on your technique. It is best to strobe and verify the setting at least once so you can alter your technique to get the result you want.
I used this ignition as a back up to make sure that my primary ignition was funtioning properly. It turned out that the engine had a problem other than ignition. So, both igitions performed up to par.
David