I stumbled upon this post while searching for something else. I work at Upmind and am happy to answer any specific questions you might have. Obviously the biggest difference from WHMCS is that we're SaaS, another big difference is that we're completely free to try.
How is styling handled wit Upmind? For example, it's fairly easy to integrate WHMCS, Blesta and others into your website design. Is that also possible with Upmind? Or is it just colour pickers and basic customisation at the moment?
Yes client area UI customisation options options are pretty limited beyond configuring colours, font and checkout flow etc at the moment but as a modern SPA it's a refreshing alternative to many other options out there
Great! Trial is available. Do you have plans to add knowledge-base like features to your BSM? So that users can set up a knowledge base for their hosting clients.