[Radio Wrangler]

Most of the USB scopes i've seen are lacking in input attenuation and control. Triggering bandwidth is limited. There are a couple of exceptions, a colleague uses a floating differential one, but most are at the toy piano level when you probably could get best use out of a good old upright, but not need a Steinway.

Modern scopes are pretty much unfixable, certainly there is no support out of warranty and I think warranty means they give you a new one. Circuit diagrams are not allowed outside the manufacturers. They think they contain crown jewels secrets.

High performance analogue scopes are infested with custom ICs

There is a sort of golden age and golden performance area where fixability is best.

David