As long as your ESR60 does measure everything, you don't need anything else! I do have the other models and they are fine, but do not give you any added value, as they measure minimal different, but the direction and conclusion is always the same:

You know our german saying: "
Wer viel misst, misst viel Mist!", which cannot be translated into english to be also funny, but it means: "When you measure a lot, you will have a lot of different measurements, which in the end does not help you either - so it is rubbish!"
I like having both values of capacitance & ESR while checking a mainboard, thus you immediately see wheter the caps are in parallel, serial or single, which a simple ESR-value might lead you in a wrong direction, when in serial...

However, if you are also in love with testgear and cannot have enough and wanna spend some money, than go for it!
Cheers!
