I use this app for every flight. My iPhone (one handed with an Otterbox belt clip for easy access and storage) and I do the preflight, then my iPad Mini (mounted on my yoke in a RAM mount using iPhone emulation mode) takes over for the rest of the flight. It has allowed me to customize my checklists, adding, enhancing and reordering as I desire.
The initial setup is most easily done via the web page where you can use your keyboard. The data entry is not elegant, frustrating might be a better term, but once you are done, theres little to do until you setup another aircraft.
Downsides:
1) Portrait only. This means that if you use other apps that require landscape or thats how you have your device mounted, you are boned.
2) iPad only via iPhone "emulation" mode. Click on the 2x button to fill the screen. Hey, at least everything is large!
3) No expanded support for larger iPhone screens, just the basic iPhone 5 size.
Requests:
1) For such a promising piece of software its beginning to look like abandonware. Yes, it is doing the job, but the interface on the web page could use some cleanup as could some of the app interfaces.
2) Integrate with ForeFlight (split screen mode would really be nice)
3) Native iPad/iPhone 6/6+ support
4) Landscape support
All the downsides considered, I love it. Ive got a Grumman Tiger, with a 37 year old POH that Id like to keep in good shape and this app allows me to keep the POH in the pocket of my cockpit.