We've been users since version 1 or 2 (it's been a long time).
Since version 8 shipped, we've had almost zero problems- plus, it keeps getting better. The latest upgrade really starts to make this software invaluable- the ability to integrate with Apple Mail has us moving away from Thunderbird- and makes Studiometry into a CRM system.
Yes, the price has gone up over the years- but, I can say that if it weren't for Studiometry, we'd probably not be in business still- it's an invaluable tool for any business that works on a project basis and has to manage many clients all at once. We're still learning the feature set in 9.0.1, but it's a really great revision. The only reason I don't rate it a 5.0 is that the interface is getting pretty busy- with all the features added, some things aren't as intuitive as they could be.