It is certainly no taller than the OEM, it might be a touch smaller. I got my replica for £18 delivered. Yeah it isn't as heavy as the real one but it still weight a lot more than the OEM knob.
You can have my old bronze skunk2 replica for the cost of postage. It's a bit warn, but with the savings you could get it powder-coated (Or even I could actually depending on colour ).