The benefit of Mark's (Hondaman's) ignition amplifier is that you get a better spark regardless of the condition of your battery, your battery can have as little as 6 volts and your bike will still run, as opposed to an electronic ignition which will run like sh1t if you haven't got a constant 12 volts. For a stock engine, the Hondaman ignition amplifier is a great device, I used to install similar amplifiers on Ford V8's back before Ford installed electronic ignitions, and they were great devices.
I don't know if Mark has changed his design, but one of the problems with the "switch-able" benefits mentioned above, is that, with his earleir design at least, you need to remove, or at least, disconnect your condensors when installing his ignition, so if it does conk out, you need to reinstall/reconnect the OEM condensors before you can ride home, which is a pain, because you need to carry your condensors and some tiny spanners in your toolkit, just in case. You also need to install a new set of points because Mark's ignition won't work well with old pitted points.
I haven't tried the Pamco ignition yet, but I don't think it's any better than a Dyna S, and I think it's over priced for what it is. If I was going to buy a new Electronic ignition now, I'd go for a Dyna 2000 anyway, I installed one on a customers K1 last year, and the difference between the OEM ignition and the Dyna 2000 was like night and day, it did everything better with the Dyna 2000, but it needs to be kept in mind that you need to have a perfect charging system to get the best out of any electronic ignition, and that's why Hondaman's ignition amplifier is better for a stock bike, especially if the charging system is not 100%. Cheers, Terry.