Is Sinn any good?

[M45]

I recently bought a DOXA and after it broke, the nightmare of having to deal with the warranty service, I just threw it in a desk drawer never to be seen and heard from again.

I see advertisements for Sinn watches a lot online, and some people seem to swear by them, and some of them actually look pretty cool, if you forgive the fact that they have more special editions than Omega during a James Bond movie release year. They also claim to be made from German submarine steel, whatever the hell that is.

Are they reliable? Is warranty support any good?

I mean, on paper, they seem to be taking off-the-shelf movements and dropping them into pretty decent looking watch cases but acting like they are high end watch manufacturer.