I have no experience with the Hantek.
With the DE-5000, I've learned to live with the boot-up idiosyncrasies mentioned above.
My calibrations, though, are very successful. Every time I measure a lab-standard capacitor, my results are quite accurate for such a reasonably-priced unit.
For low-accuracy quick results, I use the supplied alligators on short leads (4 terminal connection up to the clips) or (worse) a pair of 18" long leads to grabbers from the DE-5000 banana jacks.
For higher accuracy, I bought some extra alligator fixtures and replaced the wiring to BNCs or binding posts or Kelvin clips.
My only real problem, though, is sometimes the circuit I am measuring that looks like a capacitor (or inductor) is actually inductive (or capacitive) at the test frequency, but the meter indicates positive capacitance (or inductance).
I would prefer that it show negative capacitance, since I can easily deal with that. In that case, I would prefer a display in terms of resistance/reactance or admittance/susceptance, like some expensive bench meters have.