LogTen Pro
I've used LogTen since it's early days, and am very happy with it.
Off course there have been issues, as with any software. But the Software developer has always addressed those issues quickly and to my satisfaction.
There are regular (free) upgrades, and software fixes when needed.
I have the iPhone app, and it works fine. But I carry my laptop in my flightbag on my trips, so hardly ever use the app.
No iPad (yet..), so no experience with it's app. But I would assume it to work as well as the iPhone app.