Yeah, I've had these worries myself on the 1054z. A pity too because one of the main uses I had intended for this scope is power and energy balance measurements.
But if you want to "prove" that your apparatus under test is a "free energy" device, with a continuously decreasing energy integral... it's ideal.
One thing that i have learned in the DSO era is that if you have to make decent power measurement on power line, power inverters and so on, a digital 8 bit scope (forget virtual additional bits) plus differential probes and current clamps, anyway expensive, is not the way to go, a dedicated instrument is a way better solution.
Fo instance years ago i had an experience with a quite expensive Lecroy setup, a Wavesufer 8bit (plus virtual) 4CH 500Mhz DSO (13K euro) + Lecroy CP150 clamp current probes (4000 Euro each )+ Lecroy ADP305 voltage differential (1600 Euro each), after lots of inconsistent measurement on a 2 channel power inverter (a device working up to 50Khz), we switched to a 4CH Zes Zimmer power analyzer @ 15K euro that succeeded in its job at first try.
Then the Lecroy kit was used efficiently for some other things, i have a nice memorys for its big touch screen