As for "professional support", and any other wondrous perks that you may see offered with some other products, or that you may thing would compliment Dolphin nicely - don't think it's all rosy. We have been on all sides of this pie - we offered a fully paid version with dedicated support, we also charged premium for services, we have seen feedback about pretty much every competitor, and we witnessed the them in action, we have seen the results of their work as well... and I can tell you see more absolutely confidently that in most cases paying $2500, or even $25,000 for the license and $500/hour for services doesn't really give a significant advantage compared to Dolphin. Heavy-paying clients get stuck with same sets of problems when it's time to upgrade, transfer, etc. They experience communication issues, and have quality complains. With Dolphin, however, it is common that people learn more and are a lot more competent when working with their sites, since they just don't have that expectations of super-service provided for their big bucks.

As it is now, I am sure that Dolphin is THE best value for money, as well as the best community software out there. We work on it every day and I don't expect anyone on the market to corner us any time soon.