I own both VRS for FSX and DCS:WH.
Yes, once you have VRS you will have an addiction problem. The quality of the product is so high that you are no longer judging it that it uses FSX platform (actually it is used only to render world). Yes they have used FSX platofrm, because DCS plaform wasn't ready 5 years ago. DCS even now isn't open for 3rd party developers, but FSX did it, so VRS did Super Hornet and totally blew my mind (I am every day surprised that FSX could pull off DCS quality of pit, feel and flight model).
For me personally both sims are top awesome and I do not need anything more now.
I give them such remarks:
GOLD MEDAL FOR BOTH
BEST FASTMOVER SIM ON MARKET: VRS
BEST MUDMOVER SIM ON MARKET: DCS