I think the upgrade is more to do with the convenience of a DW rinse without changing tanks (although you have to stand over it to switch tanks with a button press, rather than physically changing tanks as at present).
I plan to keep using MkI until either it or I fail. If I have everything cleaned at that point and I’m still here to listen to the results, I’ll have to decide whether to to buy another or just refresh the cleaning with my Loricraft, which is 12 years old and still going strong.