I had one dealer installed. Works well. Has yet to flap shut unexpectedly to scare the crap out of me but that does give me something to look forward to.

They do seem high priced but if you carry stuff back there it could save you some money. With the flap closed it looks like a solid deck. Most people wouldn't know that it wasn't. Might just keep some nimrod from removing your rear window to get at what's back there.