Pros: I love the look of this product. You do not have the unsightly valve stems sticking out of your wheels. They look beautiful on my S-Lites, but wish I had put them on my 17" Mille Miglia 22 spoke rims.

Cons: They take about four times as long to fill the tires with air versus a standard valve stem. That can be a pain if your only option is to take your car to a Quik-E-Mart to use their $0.75 - 1.00 air dispenser. If you have your own air tank or quick change it is not so bad. Just do not expect to put air in your tires in a rush.

Other Thoughts: They look great, but the only problem I have is that I have to keep track of the special valve cover removal tool that is also the valve stem. If you lose that, you are stuck with no way to put air in your tires without buying a replacement. The process goes like this:

1) Use valve stem tool to remove valve cover 2) Screw valve stem into now exposed valve (it does not leak air unless you depress the center stem in the valve stem) 3) Check tire pressure and fill with air if needed 4) Use valve stem tool to screw valve cover back into place 5) Repeat process for remaining three tires

You can see how much longer this will take that a regular, unscrew cap, insert air hose procedure. But, if you want the flush look like I did, pick these up. They look terrific.