It will read the books better with a reader app than with Adobe. I use Aldiko but Mantano is apparently good with pdfs files too.
For reading pdf a bigger tablet than a 7" one may be better. I find reading on my Galaxy Tab 10" is easier, but if it is a question of price, the Vox will get the job done with the right app...
Ps: they don't have to be "legit"