Spicifically for Gizzy and Snoops.
The RNS sounds very, very good now so don't let my post put you off. Very, very detailed and smooth.
All I can say is: listen before you install. Best to go through Darren IMHO.
Forget eBay, too much of a risk to just save £50 or so and with no aftersales service.
BTW I have now got the auto rain closing function. Installed by Darren plus a few other bits 'n pieces on the MFD!