I did this in 2016 and having just re-read my review I think most of it still stands up. The organisation of this race is second to none, having now done an Ironman event plus a couple of big name 70.3 races I have something to compare it to.
Challenge Roth has the Athletes at its heart, loads of Marshalls/Volunteers make this a great experience. They are so helpful and friendly. There are little things that just make it such a great weekend,
These are just some, its a bucket list race and having now done it twice i am a lucky boy. I loved the new run course, harder but love a challenge and Buchenbach is worth the pain.
If you can get a slot - Go for it :)