I've been a customer for over 10 years. IIRC, EarthDesk did not exist back then and they did not use the Xeric Design name.
I like their products and their customer support is excellent. I really appreciate that this version is still PPC-compatible, but I can't find a reason to upgrade. Font and size are not available in version 6, or at least I could not find those options. With 11 clocks, I like to use a smaller font. It would also be nice to import preferences from previous versions, instead of having to do the setup from scratch.
I think that the first product of this kind that I used was the Control Strip World Clock CSM, now World Clock Deluxe. These days I use YouControl to track time across 16 cities. Without the ability to use smaller fonts I'll pass on this one.
As mentioned below, it also lacks maps and international weather. Another thing I noticed is that CPU usage is greater with the new version (0.1-0.5, 5 threads vs. 2.8-4.0, 8 threads).
I'll check it again in the future.