Juwel went through a period of sending out some very second rate packages with a lot of problems that they were already quite aware of, the main of these problems was the light bar failing and the center brace snapping, particually on the Rio 300 models. I personally had so many problems with my Rio 300 that i'm suprised the tank is still intact, usually i would have taken a hammer to anything else that let me down that badly, the only original part of the tank is now the glass everything else has been replaced but not before losing a few hundred quids worth of fish many of which couldnt be replaced. I have also been let down by both of the two fluval filters i've owned after both decided to dump the contents of the tanks they were running onto the floor.
Personally i advise moving away from package deal tanks, they work out cheaper but you have to ask yourself why, as with everything in life you only get what you pay for. Build your own package from seperate items with quality equipment from respected manufactorers, you'll spend a little more but in the end will have a far superior end product, and if you really cant be bothered to do that then check out the Rena range of tanks, theyre twice the price of Juwels but the quality shows.