It's going to be a different experience than the Triumph, no question about that. With the LT's you're moving into Gold Wing-like country. That said, the K1200 series motors are darn near turbine smooth at speed although, at idle they sound like a box of rocks rattling around. Don't worry, they really all do that. Ye,s final drives can have problems, but good maintenance will help hold that demon away.
One of the nice things about most BMW dealers is when they say "take it for a test ride", they're not talking a turn around the block. I logged 75 miles on a K1300GT demo, 45 miles on a K1600GTL demo, and I forget how many miles on the K1200RS I bought from that dealer.
Understand, though, that maintaining a BMW isn't cheap. Even if you do some to a lot of the work yourself, parts don't come cheap. And frankly, unless you're a really good mechanic, you're better off letting the dealer do the work (if they have good techs - ask around to be sure about the dealer's techs). BMW really does stand for Bring Many Wallets.
