Something I really like from Reaper is that they have a very periodic cycle of update releases and that issues get fixed very quickly. It is really easy to get contact with the developers and they are always looking at the forum posts.
Anyone can download pre-releases which are uploaded almost daily with new improvements. Installation is dead simple and you can easily have more than one different version installed in your machine with no issue at all.
I moved to Reaper from Cakewalk from Cubase. To me Cakewalk workflow is a little convoluted and is hard (at least in my Artist version) to keep everything clean and sorted when you have dozens of tracks and groups. I found that in Reaper is really easy to keep a hierarchy of your tracks and the routing capabilities are awesome. Sadly I haven't found a way to get the same routing power in Sonar.
And in my experience, the workload of Reaper compared to Sonar is really low and Reaper have a really useful resource monitor that tells you how much resources are each of your plugins in your tracks using so is stupidly easy to find any problematic plugin. Sadly that is not true in Cakewalk.
I use now Cakewalk mostly in order to be able to open old projects and project of some friend that use Cakewalk too. Anyway I am looking forward to use Cakewalk more.... I am still have more than 6 months of my subscription