The number of cars that have had catastrophic engine failure is a very small percentage, but design weaknesses have been identified. That said, there is always the possibility that any of us could be the next to go, but I wouldn't lose sleep over it.
Spend some time reading the posts by Jake Raby or visit his site
www.flat6innovations.com. Oil change maintenance (every six thousand miles) is very important with these engines to extend reliability, as they are subject to fuel contamination in the oil that can lead to problems.
Drive and enjoy your new ride!