It actually works. Doppler had problems with the new Cedar stack when I was using it.
Nezumi 2 fully supports the cedar stack.
Take a minute to actually look at the nezumiapp.com site. It definitely supports a lot more, and is constantly updated.
I use Doppler on my iPhone and my iPad to do things like run rake tasks, view logs, and use the console. My only complaint with Doppler has been that it doesn't recognize newly added rake tasks.