Can anyone recommend (Or put me off the idea of..) any brand of Wind Deflectors??
Thinking about getting some - neighbour swears by them but some reviews are not good....

I had some about 10 years ago in my Mondeo, they were really good if you do a lot of motorway driving but like a bit of fresh air. Easy to fit and do look quite cool I think.

I have some Heko deflectors on mine. While the deflectors themselves are reasonable, the fitting method isn’t so brilliant. They fit with a combination of double sided tape and metal clips.
I find that the channel for the metal clips is a little too wide so the clips don’t really make a good, tight fit. As a result, the deflectors drop down a little over time. There is no possibility of them falling out as they are pretty secure in the channel, but they could be a little better with the fitting kit.

There is a genuine Mopar kit in the US that appears to fit much more appropriately, however no one is willing to post them to the UK.
https://store.mopar.com/accessories/2016-fiat-500x-exterior_accessories-air_deflectors/

I have some clim air ones for sale on eBay for a 500x.....