Downside ??? A GTR ??? Are you serious??
You will have a car to be proud of and you will also know that you can kick anything else ass and at a quarter of the price of most of these so called "Badge" super cars!!
Running the GTR, servicing the GTR, loving the GTR is all "cheaper" than its rivals. Also, remember that you will have a true SUPER car here so, yes, in some ways to the "ordinary" man it may be a little expensive to fuel and run, but no where near as bad as some of its so called rivals!!! You try having a 6000 mile service on a Ferrari, Lambo R8 of Porker !!
Buy it, enjoy it take it to a track and trash all the other so called “super cars” and I bet you, you will have a smile on your face bigger that the Cheshire Cat !!!