It's a simple and well thought platform that integrate the main tools needed for collaborative and solo development. It also is one of the few that offer a complete and robust SVN service.

Combination of both repo and ticketeing system

I find the easy setup and migration from different platforms a standout feature of Assembla. The support team is really helpful, especially when we have configuration problems or need something specialized. Without Assembla, we'd be spending a lot more time and resources on having an internal development operations team. I also value the painless support and how easy it was to set everything up. We discussed our needs with an Assembla account manager, and their enterprise team handled the entire migration, which was smooth, with only a very small switchover period.