I bought this in 2007 (it's 2011 as I write this), when I started renovating a house. Over the four years I used every item in the set a huge number of times. I have completely rewired, re-plumbed and rebuilt two bathrooms and kitchen, and replaced a staircase, completely redone six other rooms, built plenty of fences, and done no end of other jobs using this set. So far only the big screwdriver bit has broken (the end snapped in half).
The masonry bits are especially good. I threw out my other (cheaper) masonry bits because the ones in this set cut through brick and stone quicker, and they have stayed sharp. The set is perfect for building Ikea kitchens, as so many of the bits are the same as Ikea use. It also has a handy "allen key" bit that almost all Ikea packs need during assembly. The assortment of screwdriver bits is good. The only thing it let me down on was a weird screw head in a Bosch (there's irony for you) dishwasher, which was not in the set.
The box is tough and solid, though the grey flip-up section with the drill bits in it needs a bit of a pull to make it move. The grey strip holding the screwdriver bits comes out, so you can take all the bits with you to do a job in a tight space where the whole box would get in the way.
Overall then, it's a great little set for anyone keen on DIY. My set has had a real battering over four years and it's still going strong.