BB, those are very good amps. When I got mine I also bought a Jumbo Shrimp (don't you just love those names?). As expected, it is a great match and you should be happy with one.
But then I learned about the Sachs and after some investigation I ordered one, mainly because of being able to have it custom built. That comparison was about four years ago so I don't remember every detailed difference, so I'll say this.
A JS Manley should cost less if found used. It will be very quiet, musical and dynamic. Manley support is very good.
The Sachs can be custom featured but there will be a wait time for build, I believe it is still a one person operation. I think the Sachs has a larger, more holographic soundstage and possibly more extended bass (I don't have subs). Also Don may now offer balanced outputs which is an option with the Snappers. You'd need to ask Manley why the Jumbo Shrimp does not include balanced outputs. But then the need for those is debatable, some love them, others don't find the need.
BTW, "Manley was founded by a woman." is untrue. That was David Manley, who EveAnna married. He left the company, she took over, and it has grown successfully ever since.
