As one of the 6 world majors this marathon is very well organised, with all the infomation you need available well in advance.
Very flat and great to get a pb. I was in the middle start wave that must have contained 15000-20000 runners so was quite congested most of the way round.
The crowd support is good with plenty of water stations & feed stations. The free Erdinger( alcohol free) is a welcome refreshment at the end.The only disappointment I have is there isnt a finishers tshirt in the finishers bag, they have to be purchased seperately.
if you like big races you will love Berlin