Even though the flight dynamics aren't 'perfect' the visual model is very nice imo
If you want more accurate (in terms of the staock fighter config for a P-51D) flight dynamics go to www.avhistory.org or www.mudpond.us and download the 1% flight model workbook --> OR one of the 1% P-51D's for CFS2 etc. The "default" data is for a P-51D-25 and all you have to do is correct the contact points and the weight & balance configurations to suit the Reno package.
If you are not sure what i'm on about, PM me heer & i'll email it to you.