I have the version without the BT support and while I wish I had that feature it was still 100% worth doing. The app is great if it's mostly "you and your spouse" but the second you have 4 kids running in from the pool or clubhouse at all times of the day, the keypad just becomes the de-facto. YMMV.
One thing I'd definitely recommend, we seem to blow through batteries really fast - a set every season, at least. If you can swing it (because they aren't exactly cheap) try the Lithium batteries instead. We use the Energizer ones but I think they're all the same. They don't really seem to last longer "in season," at least in my experience, but they definitely have longer shelf-lives so they don't slowly lose capacity when your camper is in storage. Since I switched to them, we got 2 seasons of use out of the last set, so it was worth it IMO.