Just got my Rigol DS1054z today (after my almost 3 year old DS1102E bit the dust, luckily its still under warranty)
I took a BW measurement BEFORE the 100MHz hack just for reference and I was pleasantly surprised.
It seem like my scope is actually 90MHz out of the box.
Heres a the screen shot of the 10MHz baseline, -3dB before hack and -3dB after hack.
Here how I took the measurement, I used the compensated 150MHz X10 probe (which came with the scope) to probe the N-connector of my RF signal generator.
so the baseline test at 10Mhz shows 330mV, and the -3dB point of that should be 233mV right? (330mV x 0.707 = 233mV)
also, the hardware frequency counter seems funky after 110Mhz