DTM Experience is an add-on pack for R3E. Essentially what you are buying is a pack that allows you to play races in the DTM 2013 season, but is a seperate part of R3E.
DTM E13 is well worth it's price, it has all the official cars, tracks, and sounds. The cars sound amazing as you rev up that few hundred HP engine. And the handling feels amazing and when you clip the apex for that extra millisecond off your lap time, you can spin out. Costing you around 30 seconds trying to get back on the track. After playing the DTM mods in Race 07 so much, I can only highly recommend this add on by SimBin (now Sector3).
The graphics are obviously a step up from Race 07 and it shows. The games engine has had a lot of work, as evident in the graphical changes and is simply sublime. Obviously running this maxed at 1080 for over 30 FPS, you wonder why people even buy consoles anymore.
I cannot write too much as it is only the 2013 season of the German DTM series included, but it was well worth the price. I recommend buying on sale due to the age of it. After trying this out, I will be buying the GT and DTM 2014. High quality as usual from Sector3 (still feels weird), and if you liked Race 07 and the mods from it for DTM. Grab a copy of this on sale and enjoy the drive.