It is funny how all other scopes in comparison sheets have 1GS per channel (at least stated by Tektronix guys) and only TBS2000 has 500MS per channel. The ADCs are apparently expensive even in 2016. Come on, even TDS210 has 1GS per channel.
I'm beginning to sound like a bigot here:
May be so but in fact faster A to D's little other than add noise and loss of accuracy in a 100 MHz scope. Reasons are:
1. This scope uses good sinx/x interpolation that requires 2.5 sample per cycle to reproduce a sine wave with no more than a 5% envelope error. This means the the DIGITAL STORAGE BANDWIDTH is 500/2.5 or 200 MHZ.
2. The scope on the other hand has only a 100MHz (analog ) bandwidth so it has plenty of samples to accurately reconstruct the waveform. In fact this sample rate would support 200MHz analog BW.
3. In fact the four channel version of the scope can do 1GS/s on 2 channels. but this is irrelevant with 100 MHz analog bandwidth.
4. At any given price point faster A to D's are noisier, have poorer dynamic accuracy (less effective bits) and generate more heat which often times means adding a noisy fan.
Lessons:
Engineering is a trade off. In the case of a scope a series of complicated and none obvious trade offs.
Comparison sheets by ANY manufacturer are generally crap and obviously biased. Make your own. compare only those specs that are important to you.
Ask the manufacturer of the scope why you should buy his scope. Filter this input based on your experience with the individual you are talking to. Do they know what they are talking about? Have they ever lied or misrepresented a product? Many reps simply just echo what they are told by the manufacturer.
The devil is in the details. If you can not or do not want to compare ever spec in a spec sheet (and even then only a couple of manufacturers guarantee their specs) then you will have difficultly making real comparisons between various scopes. This is not intended to belittle anyone. I know of only a few customers who ever did this in a valid way.