I have never been a big fan of Pertronix, and I'm even less of a fan of these cheapo copies. There is just no way you can shoehorn a capacitive-discharge electronic ignition circuit entirely into a little module like that without making some big compromises in the design. I think a better option is one of the units with an external electronics module. If the nonoriginal appearance bothers you, you could mount it somewhere out of sight, and, with a little cleverness with the wiring, it would be hard to tell that it's not an original setup.
Given all that, the Pertronix appears to be a decent-quality component. I've heard nothing but bad things about those copies, mostly poor reliability.
I had a Crane XR700 in my Bugeye Sprite. I liked the unit, but the shutter that goes in the distributor didn't fit well. I ended up making my own on my little lathe, not exactly an option for many people. I now have a 123Ignition distributor in my Porsche. It isn't cheap, but it works well, and I like knowing that I have the right advance curve. I am considering getting one of these, with the programmable advance, for my TR4A. I have to confess to using a Pertronix in the Porsche for a while. I had no problems with it.