It works fine, but the ui is archaic and the developer is a jerk. Wouldn't even acknowledge huge bugs in APDL years ago, much less fix them. No glaring bugs in Logbook Pro though.
I refuse to pay for their cloud sync, I'm perfectly content doing manual exports and imports. Of course I also can't be bothered to enter data every leg on my phone (did that for awhile with APDL, it got old QUICK). I just export my schedule once a month, import it to Logbook Pro, fill in landings, estimate night and instrument, bam done. Using it on my phone is way too much work.
Sent from my Galaxy Nexus that ate your iPhone.