Well, you don't really get an option to buy anything other than this to mount your Garmin device to a set of oversized handlebars. It's rugged enough but it's a real shame that once the device clicks in it has about 2mm of 'slop' that the GPS can rattle about in: pretty poor design really. OK for road bike, but the rattling might drive you nuts after a while on a rough trail on a mountain bike (you might mitigate this using some silicon sealant or a small piece of rubber).
Very important note: it comes with no 'device clip'; it's just a 'wraparound' for the handlebars, so you'll need to purchase the smaller bike mounting kit which includes this clip UNLESS you have an HCx unit which comes with a clip that screws into the back of the battery case as standard (mine, the Legend HCx, does).