Startups 411 is a very niche app with a very specific audience, so I'm not sure how many total sign-ups I can expect, but so far I'm very happy with the results. After the first day I have a little over 100 new subscribers to the beta list and I had a well known angel investor follow the app's Twitter page!

To top it off, I noticed that Startups 411 is now in the "Trending Startups" section on the BetaList.com home page! So that all feels totally amazing!

With that said, my feelings won't make my app more awesome, so has anybody here used BetaList? If so, how many beta users did you get? How engaged did you find your beta testers to be once you sent them your beta? What are some best practices for keeping beta testers involved and happy?

Thanks for any advice!