Love this app! Makes my bird counts quick as a snap, and then submitting to eBird painless. On the plus side: number and species entry. The default when entering observations is number (quantity) first so you enter the number of individuals observed. Add a space and then youre in text mode so you can enter the species name. If you know the 4-letter code you can enter that way as well. If you see more of the same species later you can either enter just the additional quantities the same way (and it will add the total for you) or tap on the species name and increase the quantity by one for each tap. Just a speedy process either way.
The only negative for me has been the somewhat cumbersome process of entering location. And you have to do this before you can begin your count. So if Im seeing species quickly and want to document them, I have to first enter the location which could take long enough for my feeble brain to forget what I just saw. I dont know if entering the location at the end would solve this problem, or just make it more confusing for those times when you have multiple lists going.
In any case, I highly recommend the app for anyone who likes to track their sightings!