Some issues
I downloaded it and thought I'd check out Qantas seat maps. Browsing by airline, Qantas isn't listed! Investigating further, I found that bmi, Finnair and Kenya Airways are missing as well. (The thing these airlines have in common is that on the seatguru.com website, they're each listed first in their section of the A-Z list of airlines.)
The other issue I have is that the seat maps aren't stored in the app, but you need a network connection to view them. I feel that travel-related apps must provide as much functionality as possible in Airplane Mode, which isn't the case here.
Anyway, it's a good start, and should be easier to use than browsing their website on the iPhone.
(BTW, I left these comments in a review on the iTunes store as well.)