Hello smgvbest!
I own a MSO1074Z-S, I have used the oscilloscope for one week only. I've only been able to test it in daily use with sinusoidal signals, the FFT is somewhat vague (it gets input from screen, no memory), but have dBV scale and is enough for simple tests. I tested the logic analyzer and somewhat the signal generator. The autocalibration of channels is a very slow process, about 20 minutes.
This model with the latest version of firmware is not public hackable to my knowledge, some users have reported hacking it, but they have not put the info for it anywhere. Surely it will be hackable in the future. I do not want to break the "void warranty" sticker.
However, the oscilloscope without hacking meets my expectations and I do not need to pay for any additional option for common use.
The LA works fine with no problem, only several times slow than Agilent equivalent but nothing unexpected or that makes it unusable. The LA POD is warmer to touch. The decoding is useless (made in software, not hardware), maybe the serial RS232 decoding was useful, but it is very slow and It can slow down the oscilloscope UI, block the scope and force your to recycle power.
The signal generator is a bit awkward to use, because it has not dedicated knobs, but not impossible to use. It has No input modulation (but AM/FM internal low frequency modulation), no external trigger input, no trigger output (but You can use second channel for it), no external source of time base. Very limiting, but useful for some tests.
I go to coding a MATLAB Frequency Analyzer thru SCPI programing via Ethernet (I made it time ago with Series 6000 Agilent scopes, and Agilent Arb signal generators), using the generator and the oscilloscope itself. I hope I do not have programming problems... I will see..
In short, a compact and affordable oscilloscope for less than 1000 euros.
I also will go for the DSA815TG when I have the cash
Regards
Manuel