Re: Jupiter Saxes
I've never been much of a fan of Jupiter saxes. If my memory serves me correctly, those horns were designed to have a middle register that's well in tune, but that puts the low and high registers WAY out of whack. I've also seen a lot of issues with responsiveness, especially in the low and high registers.
I HAVE heard a couple people play on jupiters that sounded great, but more often than not they could sound a lot better.
The only thing I might see as a pro to these horns is... at least they're cheap horns. For the money though, I'd personally look for a different used horn... sometimes you can find insane deals on horns if you look around in Classified ads in newspapers and online.
I might be a bit biased, being an avid selmer lover, but I hope I was a bit helpful.