rear drop plates

Is anyone using rear drop plates? they seem like a really good idea ive been looking for some but cannot find anyone that makes them anymore? so i have sourced a local company that can make them so my question is this… what are peoples experience of them and would anyone be interested in buying some? once i know how much interest there is i can get a price thanks 

They're good for running uber low while keeping better geometry. I'd say the market is pretty small for those wanting to run that low hence the reason no one sells them.

How much