I just put in a Velleman ignition booster on my Wards / Benelli 350, and it really helped the ignition, especially at idle (it's not registered yet, so I can't test the highway speeds).
It runs more smoothly and easily now.
I know that's not really on-point for your question, but it does demonstrate that the transistor ignition units do help the performance.
Hope you get the info you need on the Rooster unit. If not, I encourage you to try the Vellemans.