I would complain that you have been sold an out of date tank then and demand that you are at least compensated for the work and materials needed to fix your tank, i bought my Rio 300 in 2000 and it has the push fit braces so your tank must be at least as old if not older, you wouldnt expect to be sold a computer built 5 years ago when buying a new one from the computer shop so you shouldnt expect a 5 year old tank when buying a new one at a fish store.
i totally agree but have you ever tried to complain to wildwoods? their customer service is awefull. i once complained that they were selling house plants with an aquatic plant label on the tank. needless to say they died a week later. the response to the complaint was that i could have a full refund if i brought the plants back in their original packaging!!!
"sorry mate funnily enough theyre planted in my tank" was the obvious responce. brick wall hit - no pot, no refund.
needless to say i only go there when i have to.
i've got a mate calling norwood at the moment to find out the date the brace design changed. he thinks mine is a new style and the click in ones are the old style. i'll wait for their response and react accordingly.
although wildwoods is an awesome shop (physically) i really hate dealing with them.
oh and they killed a zebra plec today

(okay not deliberatly, sorry) i asked if they'd sold out and the lady said there was one left in the end tank. after a root around she lifted the bogwood to reveal mr pancake zebra.

such a shame although i did snigger to myself regarding the cost of the lost stock.....
update: just spoke to Juwel UK and the new tanks have an injection molded centre brace, the old tanks have the clip in ones. damn it!!.
i've forwarded this thread to Juwel and they are in turn passing it to germany for product development purposes - result!
still doesn't help me though but they were very interested to hear the feedback.