Well, congrats. I worked with one at one time and found the 50Ohms-only inputs annoying. But if you don't bother exchanging the scope on your desk when you want to do general-purpose, 1MOhms measurements, you got now as much speed as this series can provide.
Oh dear, I never realized it was 50R only !
Not dreaming of it any more... back to my original TDS784D plan then, much more attainable than a 794D !
I thought the 794D was just a 784D pushed to the limits of its B/W and sampling rate. Didn't look at it in more detail...
I guess any scope above 1GHz is 50R only. 1M for slow scopes up to 100MHz usually, and scope's "in between", from 200MHz up to 1GHz, are 1M with the possibility to switch to 50R.
Like... my 100MHz Philips/Fluke Combiscope is 1M only, but my second Combiscope, same machine but 200MHz version, is 1M + 50R.
My TDS 544A is 500MHz and is 1M + 50R too.
.. but my TDS 694C is 3GHz and 50R only.
OK so back to my initial 784D plan then...