Yes, it's really expensive.
As for the 3M, the shop that installed it has closed, and the new shop that opened in there now works with LLumar as well...
From what I've researched, LLumar is very good as well, the drawback being that for the same "tint-level", the 3M can block more IR.
On the other hand, the shop prides in doing very high-quality installs (they specialize in custom multimedia installs - redoing dashboards and such, even for Ferraris
and everything looks like factory built.
But with those prices, I guess I'll only make up my mind when I actually get my X1...