I took a year and a half sojourn with Reaper, paid the 60.00 license fee. To this day, the orchestral project I did with it is the best sounding piece I have done, but that's probably because the others were all done in Sonar 8.5 or earlier. Now that I have an up to date version of sonar, hopefully I can match that. But Reaper is indeed impressive. It's the only DAW besides Sonar I can use. Sonar's workflow is just easier for me.
Reaper devs are working on a Linux version. If they ever get it to the point where it works with Windows VSTs, it will be extremely tempting. I am on Windows only because of music. I use Linux for everything else. I'm even fooling around with a BSD system. But for many folks, it will soon be possible to do on Linux what they now do with Reaper on Windows, and that is amazing. Those guys are geniuses.