Ordered this to go with another 6'x4' whiteboard I use constantly. When it arrived, it was dented in several places and wasn't suitable for heavy use. Looking carefully at the construction it's made up of a lightweight backing board behind a thin skin of steel. The backing board is very flexible and so the whiteboard tends to bend easily when transported.
The original was returned and a replacement arrived with fewer and less serious dents and marks. It was just about OK for the price as I didnt want to spend £200 on a better quality one.
The fittings that come with the board are easy to use to fix it to a wall, although it does move very slightly as the four plastic brackets don't hold it tightly against the wall, despite being tightly screwed in.
In use the board is fine - I don't like to press too hard against it and definitely don't lean on it for fear of denting the surface. It wipes clean easily, is brilliant white and even pen that's been on it for several weeks wipes off easily (at least the superb Pentel Maxiflo pens do).
If you want a great big board at a budget price, this is OK. Just treat it with care and make sure it arrives in good condition.
If you've got people who don't treat things with respect, or it's going to be in a very heavily used meeting room, spend more for a board with a solid back.