If you want a simple , cheap, bolt on kit for a points bike there is not a lot of choice.
I bolted one on to my R75/7 almost 20 years ago and it has been fit and forget - I haven't touched it since.
There are probably crank mounted systems around for five or six times the price but they bring their own problems and the bike won't run noticeably better with them.
I fitted a timing chain and Dyna coil at the same time and there was a noticeable difference in starting and performance, but that was from a low base1
Boyer now have their own twin coils, and they seem to be very helpful if you call them regarding the best set up.