I have a 6 x 2 x 2 Happy Hutch single storey hutch which is about 18 months old the floor has bowed on it and needs fixing back up, apart from that I cannot complain on its current condition. It has been wood treated twice since I had it and all the seems sealed with silicone which all help to keep it in better condition.
I also have a Ryedale hutch for my piggies a quadruple storey hutch which arrived Easter 2008 and it is still in pristine condition. The wood which supports the floor is far thicker and when you move it, it is far heavier and more solid than the happy hutch.
I don't think there is anything wrong with the happy hutch hutches if they are wood treated every 6 months and sealed however it won't last as long as my Ryedale.
If I compare the happy hutch to the rabbit shack hutches and the ones like the thistle hall, they are clearly made from cheaper softer wood. I was given two brand new ones this time last year for the piggies and both have nearly had the wood on the door chewed so badly that the mesh wont be safely held in them for much longer. Sadly the hinges and the bolts are far too weak and small for use on a hutch.
My personal feeling is that it is better to spend a bit more as cheaper hutches are a false economy.