^^To the question "which scope is good?" I can draw this conclusion from both the above replies - depends entirely on your need. Now I need something better. So I'm hoping to see a low-end scopes comparison. I can imagine that this is going to be a ton of work and will take up a huge chunk of time.
Dave (EEV): my 'expert'
suggestion - group scopes by bandwidth - 25MHz, 50-60MHz, 100MHz and 200MHz. In each category compare features like samples per sec, memory depth, screen refresh rate, etc. Useability is important - cluttered menus, poor LCD contrast, etc. If you do tear them down (which I think would be absolutely awesome!), it would be interesting to see the similarities/differences in each category - overall internal build and layout, AFE/input, chips used (local vs. quality manufacturers), CPLD/FPGAs, memory (SRAM/DRAM), DSP chip, power supply quality, fan :-P etc. If you could also point out the features that most annoy you, and the 'coolest' features that in that particular scope, we'd be able to make a better informed decision.
You could make 4 videos; one for each bandwidth range. Cover 4-5 of the most common scopes in each category. The first one would take the longest time, but I think things would become easier and quicker after that.
Take my word for it - this will be exceedingly helpful to scope noobs and people buying their first decent scope. Lots of work, but thou shalt have our adulation