Firstly, here in Europe at least, everyone has the right to try something and if they do not like it if bought online, return it. For whatever reason. Then the retailer should return it to where it came from and that will be sold as refurb or whatever. I know people who buy from amazon, use something for a week then send it back, cheaper than renting for sure. But it is LEGAL over here.
In store stuff is different, becasue you had it in your hands before you bought it. But if someone points you wrong then you have rights and the shop has an obligation to make you happy.
Back on track here, why would you think a crop sensor camera would match a seriously good full frame camera? I am not blaming you but there is way too much BS and marketing leading people wrong, in pretty much every product on the market. But the internet is full of test and reviews and samples, just a question of homework.

I was going to keep the camera, but about the flash not being suited, even on manual mode which is what I would set it to, im taking it back, but they should give better infos at that store, even if its a future shop.
The D7100 is a great camera for a cropped body, and i love it overall, the kind of pics i do needs flash.
The best homework is to be in a live situation with gear.
. Who cares about IQ, what you did was pretty lame. I hope they dont let you refund the 70D.



