Ok, so I got these for a lot less than they are being sold here but I really struggle to see what people could find wrong with them. They are flimsy, yes, but this is because they fold up very compact. They certainly don't seem fragile or even slightly loose around the joints. When on the head they are as strong as any other pair of headphones.
The technology works a treat, my iPod, mobile, PC and Mac all connect and sync perfectly. My iPod is a new 4th generation Nano by the way, so there is at least one accessory that works with them! (Most pre-June 2008 accessories don't work with the new touch and Nano models.)
The sound quality is excellent for wireless headphones and the volume (and bass) is also very good. If you see these for £40 or less... buy them! The iPod dongle itself is worth at least £25.