I don't think anyone on here has tried it as I'm sure someone else asked once before, it seems to get fairly good reviews on Zooplus though.
I know Mark and co highly recommend Orijen dry from zooplus. I use the Pets at Home own brand (premium one). It has very similar ingredients to JWB but is so much cheaper, it always seems to be on BOGOF during Bank Holidays too so great for stocking up on. They give free samples away in store so you could get a few small bags to try, there's also a 100% money back guarantee so if you buy a bag and your cats don't like it they'll give you a full refund.