Has anyone tried the WindBlox windscreen on their convertible, it is made of Lexan and straps on to the headrests.

 

No, but then my '07 XK came with a windscreen.
The headrest straps on that unit look a bit wonky, but then its a whole lot less expensive than the factory unit.
A windscreen is definitely a must have. Driving at highway speeds with the top down, windscreen in place, and windows up, my wife thought it was great, no draft to mess her hair, or cause an earache.
I kind of like the fact that mine also covers the rear seat area, so no worries about anything back there blowing out, but it does limit the height of items you can carry back there.

 

I have the Adamesh windscreen on my 12 vert. bought about 2 years ago for approximately $400 delivered from the UK and the delivery took no more than 5 days. I highly recommend it. Go to their website for a look at it.

 

I too have the Adamesh windscreen and fully endorse this product. It is exactly the same as the Jaguar OEM Windscreen but at about 1/2 the cost.

Delivery was within days of the order and the windscreen just snaps into the side holes on back of the front seats which is a 1 minute install. It also flips up and down, and blocks 90% of the wind that buffers back into the cockpit.

A great product. Here's the link to Adamesh.

jaguar convertible wind deflector | jaguar xk8/r wind blocker

Mina in the USA also has the windscreen exactly like Adamesh.

Jaguar XK & XKR Convertible Wind Screen Deflector (2007-2011) - Mina Gallery Inc

Hope this info helps.

 

+1 on having a wind diffuser. Got mine on EBay for $290 including freight. Factory OEM that was very slightly used. Wife is very happy!

 

I ordered the Adamesh last Monday and it showed up on Thursday...The fit and finish is great, and in the 3 days I have used it I think it works wonderfully. Highly recommended.

 

Glad to hear the Adamesh worked out for you. It really does help.