I've been looking to fit the Touratech/Nippy Normans toolbox but have recently come across a "similar" box generally available at half the price ... has anyone any experience as to whether the cheaper option is just a cheap Chinese knock-off that will fall apart after a year or whether it's a viable alternative? I prefer to "buy right buy once" 
Touratech linky
Chinese knock off linky
Touratech linky
Chinese knock off linky