Useful but buggy
The application quite intuitive, user friendly and designed nicely.
The price is quite high for what you get, after all this is an iPad app, not a professional translation tool.
I think it would be more popular if additional dictionaries would cost a dollar rather than $10.
Be prepared that the app will occasionally crush. Upon reinstalling Lingvo, the in-app purchases will disappear and ABBYY support will tell you to go to iTunes, while iTunes support will tell you to go to ABBYY...
Masaraksh about
Lingvo English Dictionary, v2.1