xyzulu I tried it, had a pretty poor experience. There were basic settings that you can't even change, like setting what default money you use in your shop, couldn't change from £ to $, they had to completely reset my entire shop to change it. There were highly visible bugs all over the place, like when configuring a product it wouldn't let me enter a setting without first enabling another setting first - their fix was to enable the other setting, change the setting I wanted to change then disable the first setting that was buggy - wut... Beside all the bugs, the whole backend is really weirdly laid out and disorganized imo. The support was ridiculously slow, for such an important function dealing with customers and $ I can't be waiting 24-48 hours to get an answer about something.
Lastly, I'm always wary about SaaS apps, because what happens if it goes offline? I can't do anything but wait for it to come back, my customers too - not very professional if I have to tell my customers "we're waiting for our SaaS to update us on a fix", and of course I think it was last year that they had an outage that lasted at least 1 days, maybe longer I can't really remember.
So all that combined, and then you look at the pricing which is same/worse than a well established like whmcs and the decision is a no brainer. Upmind isn't anywhere near production ready.