I like the size, shape and feel of the Blaster 3 button pads. The 3rd button toggle switch on these is also well hidden along the bottom edge of the controller.
On the other hand, the one and only Blaster I've ever owned just recently started exhibiting weird symptoms. Up won't work unless you press it really hard (or at the right angle), and games keep pausing randomly on their own (assuming because the "RUN" button keeps getting triggered somehow).
I took the thing apart and cleaned it (though it wasn't really dirty to begin with), made sure everything was in order, and put it back together but it still does this. I'm at the point where I think it might actually be some sort of logic or PCB issue.
Since this is the only Blaster I've ever owned, I have no idea if these things are prone to breakdown or if I just got unlucky. I've owned it for years, and if you'd asked me a year ago, I would've suggested the Blaster without thinking twice.