I have the JP Cadence (mid-range?) model which I love - but having said that, it's the only one I've ever played. It was an ex-demo purchase, so less than half the rrp. Excellent build quality, and first class service from John Packer. I use a Runyon smoothbore m/piece. I might swap it for a BW if I had the money, but only because all my other saxes are BW!!
My tech has nothing but praise for the development effort put into the baritone based on advice about intonation and other issues given to the company by techs and players alike. Bryce says the only complaint he has had was from a player who bought the Bauhaus as a back up to his MKVI baritone. The complaint was the Bauhaus was too in tune (!)
I'm citing Bryce's view and he has a commercial interest but I haven't played the horn myself
I have had a JP Cadence bari like Pyrographics for a few years now - likewise, ex-demo and a bargain. My then teacher played one and his got pretty hard use on gigs. No complaints at all - not much to compare it against, to be fair, apart from the second-hand dogs I tried before deciding to buy new. It's never needed any attention which is pretty amazing when you see the long key arms on it which you might think would get bent pretty easy. I use a metal Yani 7 for band work and the original Yamaha 4 for more contemplative stuff.
I've blown John's BW. It didn't have the ooomph of my old weltklang but it was an easy blow, the action is light and responsive and it played in tune with a very musical tone using the Selmer S80. It looks quite stunning too. I couldn't fault it.
I had a JP 044 Bari sax (their entry model) which I enjoyed playing. It was never perfectly in tune across the range of the instrument, but for the price it was pretty good.....
......until I bought my YBS62, which knocked spots of the JP044!
I had a BW Tenor (the action improved bronze model) which was pretty good.....until I got my YTS62