Personally, I hate the "Box" tanks... meaning the ones that say to "just add water and fish and your set!" I think thats a load of sh&t because the pieces that come with most of these sets are crap to make them affordable. I'm not saying this tank will crap and I actually think I have seen another TFF member turn one of these into a beautiful nano. I just think it's more fun and easier to make a tank that you can call your own by putting all the pieces together yourself. But, just my opinion.
I think it is possible to do a FO tank as long you enough man made filtration, either through HOB filter(s) or external canister(s). Like you said though, kind of takes a good look away from the tank. When someone says marine, most people would expect some beautiful rock work in which the fish swim and in and around