It's such a simple idea, executed brilliantly. The first thing that strikes you when you open the box is the sheer quality of construction. I like tough, elegant designs that will last for years, and this exudes both of those qualities in spades. Quite honestly, if you threw it at a wall, I'm not sure it would notice (though the wall would!).
It's plenty big enough for any load I've ever baked, though this does mean that a long bread knife is preferable, and does what it sets out to do perfectly, without taking up nearly as much room as the vertical slicers. The removable crumb tray fits perfectly (not always a given on these sorts of thing!), and the slots are at sensible heights.
If I was being hyper-critical, the tabs which secure it against the surface edge are a tad on the small side, so if you have wide bevelled work surfaces you need to be sure that it's well secured before cutting, but other than that very minor point, it's a genuinely awesome product which I would happily recommend to anyone.