I’m currently using Subscribe to Comments Reloaded, but my company is developing a new plugin that’s almost ready for release and that will essentially replace Subscribe to Comments Reloaded. I’m a lead developer on both projects (Subscribe to Comments Reloaded and the new one being developed at WebSharks), and the new plugin has import routines to make transitioning from one to the other as seamless as possible. If you’re in a hurry, I suggest installing Subscribe to Comments Reloaded and then switching over when the new plugin comes out. 🙂