Hey, Rob:
Welcome! I use Reaper, too. Podium won’t replace Reaper (for me, at least), but it’s a really good program. I especially like the spline-based editing — in fact, the whole way automation is done is great. I also like the hierarchy, the MIDI editor (though I wish it had play controls like Reaper does), and the navigator. The UI is gorgeous. It’s nowhere near as sophisticated on the routing end, and the MIDI export stuff is pretty rudimentary.
One thing that may take you awhile to get used to — it did me, anyway, is how Podium handles bounce tracks. Pay particular attention to that in the manual. I’ve been using the program about two months, so I still have a lot of learning to do. But … it’s definitely on my list of hosts that I’ll continue using.