Do you plan on woods riding or MX? I wouldn't use them for MX. It's too easy to get you hands caught in them if you go over the bars and you'll snap your wrists. For MX you are better off getting those ACR levers that fold out of the way when you crash. Putting some teflon tape under the clamp is anothe rtrick to let the perch rotate on the bars.
If you are just in the woods them they are a must. You don't really need the plastic though, it just gets broken when you plow through deep brush and small trees...not that it happens too much :laugh: