We always thought Golden Pixie would be a good seller; it was the very first testbrew we did back in 2012 and it's come a long way since recipe-wise, although it is essentially the same low ABV golden beer hopped simply with Summit, Cascade and just a touch of Citra.
For a while sales didn't go well and we struggled to shift a full brew of it, but gradually - I'd like to think in some part due to the recipe being honed to a razor sharp point - sales have increased and now we brew 12BBL of it (around 2100 litres) every 2 months or so. It also helps that we have a pub which takes a dozen at a time for it's standard cask session beer plus Hopbunker sells a fair bit of it!
The other big thing is the "third tank" which I'll explain more fully in another post, but basically when we do a big brew - 12 barrels - of a beer we get 3 conditioning tanks full of beer. Two we normally dry-hop and sell as the beer it's supposed to be, whilst the third gets dosed with different (and more!) dry hops and sold as something else.
So, today we brew Golden Pixie v4.0, which has has a bit of a tweak with it's hopping rates although the malt bill is now pretty much set in stone. Hopefully it'll finally become the finished version, although as most brewers will tell you there never is a finished version of anything you care about!