Hi Beltdrive,
I have a Fluval Duo 1000 tank and the stand on that is fairly similar. I was a bit concerned about the strength of the stand, but took the stance that Hagen must have done their research as it wouldn't do their reputation much good to sell a tank/stand combination that wouldn't bear the weight.
I have also had a search on the web and not come across any horror stories.
Having said that I have made sure that my house contents insurance covers me for any damage to the flat below in the event of a tank breakage......
Cheers, Eddie