The only trick is, as I noted above, making sure your static ports are at least as large as recommended in the instructions and to make sure they are not obstructed at launch. The Estes altimeter is fussier than most others about launch detection - it seems to need a fairly rapid pressure drop to notice it's been launched. Unfortunately exactly what it needs is lost in the code at the Chinese vendor.
AltimeterThree is coming along - the interface software is getting better and more reliable (real "fun" with the Bluetooth link) - but is still a work in progress.