The app is clearly popular, as it was the top-grossing third-party product on the App Store in 2010. If you've been toying with the idea of buying Ignition, LogMeIn's current special offer might tip the balance in its favour.
The iOS version is currently available for $15.99, while the Android version is $14.42. That's roughly half price. The offer is for a limited though unspecified time.