USB oscilloscopes

Look very carefully at the specs if you decide to go with a pc-scope. For 100 MHz on two channels you would probably want a 1 GHz real-time sample on each channel. That gives you a 5th harmonic on a 100 MHz signal that's just at Nyquist. AFAIK, there are no pc-scopes with that capability (at least, not yet).

Some claim x GHz "equivalent" or "repetitive" sample rates but it's likely that at least some of the important things you'll want to see are not repetitive events.

i wouldnt bother with them, if you need a cheap scope look on ebay.

I bought the SDS200A from SoftDSP about two years ago, and I'm very pleased with it. Specs: 2 channels; 200 MHz (-3 dB) bandwidth; 100 MSa/s using one channel, 50 MSa/s using two channels; 5 GSa/s equiv (for repetitive signals); 9 bits/channel vertical resolution; 10 KSa to 512 KSa buffer.

Best,

experience with either PICO or Link in a 100MHz dual

to fill my home and/or hobby wish list.

A PC scope is usually a poor substitute for a stand-alone. I see only two useful applications.

For anything else they're just crap.

I have one, got it strictly because I needed to cover point 2 above cheaply. I needed at least 90dB dynamic range so I got the adc216 from pico, 16 bits. Standalone digital scopes all trade in their resolution in favour of speed, which sells better I guess but does not cut mustard for me in this application.

You did not state what you need this for.