I've just bought a JHL one for my mare, she's not been out in it yet and only got her in Oct so don't know how it'll last. Fits her nicely though (v chunky 14.3 cob) unlike the shires tempest one which was like a second skin!
I bought an Amigo Bug Buster last weekend (and it has the built-in fly repellent too) and am really pleased with the fit. It's very soft, covers well and doesn't rub. This is the one I bought http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=170609165670 I Best Offered below the asking price so it wasn't too expensive either.