My supervisor at work tryed to hard-sell one to me after the 404 I used to have started giving out electric shocks.

A friend of mine has had one part-empty a tank onto the floor. (about 1/2 the contents of a 100ltr tank in about 1-2mins, the resulting mess I helped to clean up.

) I bought a Fluval once, but I won't be making that mistake again

overpriced s**t IMO. I know a couple on here have found that the 05 series diden't improve much water-tightness wise also...
I'm not shure if it has improved much the the 05 series, (I doubt it highly having compaied the designs quite closely) but keeping it clean enough to work with the 04's was far harder work than with any other brand, mine needing weeklyu attention where my TTs needs attention every 6 months or so... The small surface area made them very prone to clogging, along with channeling, and they aren't the easiest to prime IME. After struggling with the thing many times, I found that running a bucket of water through it under syphen before starting it up was the easiest way to get it started, allong with a hard kick in the correct place when the impeller inevitably jammed...
If you want a good filter, look at the Tetratec and Eheim ranges

The TT's are cheaper, and IMO are better all round. The Eheim pro's and pro2's aren't far off on price, and are widely considered the best filters on the market
All the best
Rabbut