I'm with Discspeed with the Amp/Switch comparison.
I've got a non-first run Amp, it was fairly stable new, but I can hyzer-flip it to close to 350 on some throws now. So, doing field work where I'm unloading all my drivers, some sets the Amp is the longest disc (but that's usually if I miss on the Star Terns.)
It's actually pretty similar to a fairly new max wt. Inertia I'm working with right now. But I don't know if it's in jeopardy or not. The 168 Inertia I had, once broken in, was a different animal.
I tell you, as it's gotten more miles on it, this Amp is not unlike a solid Star Beast.