Hi Richard. If you are happy with 6, I advise caution with jumping to 8, or even 7. I accidentally made the change to 7Pro a couple years ago and got in too deep before discovering bugs. My friends who use 6 remain content.
One bug is "Light Time" appears to randomly switch to OFF, making the display of planetary events different to observed in time. I spoke to David Whipps of Simulation Curriculum about this at NEAF and he later emailed that a bug was found, but I still observe the problem and I can't make it reproducible. I add that prior to speaking to David, I got the run around on their website support page for months. So a bug was found, but apparently there's more still creating the problem.
Another bug was with an inaccurate calculation of the Moon's phase. I discovered this after GSSP when some of us discussed how young the observed Moon was. This time I jumped to posted on Cloudy Nights. The bug was verified and "corrected".
BUT, just last week I was planning a January 22 public event and noticed that the phase is again off (now negative!), so something goes wrong with the Moon in 2026 - look out!
As mentioned above, the user interface takes some getting used to. Plus, there used to be a setting where you could not only change the position of icons along the bottom, but also remove unwanted ones. The ability to remove unwanted icons disappeared months ago with an update. Even worse, they were joined by icons that appear to be related to the Pegasus SmartEye, which I have zero interest in. So, now the bottom of my display is cluttered with unwanted icons, which hey!, create necessary lgiht as well.
I'm hopeful 8 fixes will fix these issues, but I do not yet know and I am unwilling to pay more money to discover new bugs.
I hope this is helpful.
~ Dan