I think it was a mistake to market the same controller under 3 names.
Growing up, I had no idea they were the same thing! I'm sure others were confused too.
Also, for the touchpad, I did like how low the keys were. It made it hard to use it with an overlay.
I like the idea of the touchpad and wish more games utilized it, such as Space Shuttle and Tomcat F-14, but the reality is that it is very hard to succeed with secondary controllers, especially if they didn't come with the system.
Even the NES Zapper, which might be the most popular secondary controller of all time, failed to get 20 games out of 700 released for it.
BTW, I bought my Star Raiders on clearance in Meijers in the late 80s.