Let's see. AH ! Boots. Right. The a-stars have more heel reinforcement and an almost ridgid sole which is ce. They also have a rubberized toe and use slightly thicker "leather". They come in half sizes. The tourmasters didn't.
Now the downs.
Thick toe difficult to get under shift lever. Ski-boot rigidity forces front cuff against my shins. (motorcycle socks ?) Slightly heavier than the t/m. Enough velcro that a rescue squad will need the jaws of life to get me out of them. And a chainsaw. And plasma cutter. $2.00 more than the t/m. big whoop.
For immediate comfort the t/ms' might have been better. They looked a little better too. For safety/durability, I bought the stars.
It's not that the tourmasters were bad. If I were riding an FJR, I might have bought them. They were higher on the shin and softer, too. Both are waterproof. Thus ends my assesment.