Always liked the crown on that one. It's big without being BIG.
And I believe mimo is a fan of that design
I've never owned a Sinn, but they've got a pretty outstanding reputation for quality and build. It does use a Sellita sw220-1 movement, though, so it's not completely German :p
Dino mentions FPJ earlier items had issues and I have heard of a couple of issues with Richard Mille watches breaking. I wouldn't say either of these are known for breaking, like it is a running joke, but I would assume small batch production watches from independents could have issues down the road.
When it comes to pre-owned, it certainly pays to have the buyer either a) furnish a receipt for a manufacturer overhaul from within the last year or so OR b) Only pay fair market value less the cost of a manufacturer overhaul.
Of course, all that gets dicey when you're looking at something rare or vintage.
I wish German car service were like it is with Rolex or Omega. Send it in, pay $600-$700 and it comes back brand new.