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The support is amazing, Felgo guys helped a lot to get our first app released. My company is now eager to do more app projects in the future.Kiril Papaz has used this product for one year.
With the plugins you can resolve a lot of native integration problem. Fantastic customer support.
I don't see particular cons.
From my point of view if you want developprofessional mobile application using qt and think that your time is important, Felgo is a must to haveNicola De Filippo has used this product for one year.