While touring in Florida a couple of months ago, I met a guy on a 04 R1150RT. His RT had two final drive failures in 75000 miles, plus, he was so paranoid about another failure that he had a complete final drive unit boxed up in his garage so that he could have his neighbor mail it to him in the event of another failure. He was stranded many miles from a dealer during both rear drive failures.
I love BMW's, but my last, a 04 R1150RT, had several issues, oil leaks, and ABS brake modulator failure. Both of those issues were repaired under warranty, but I sold the bike right before the warranty expired.
I would not consider another BMW until they go back to the unlimited mileage warranty, and solve the problem with rear drives!! However, I do believe that the rear drive issue may be overblown, at least to some extent.
I'm planning on a new touring bike in 2011, and am crossing my fingers that the new ST is a little lighter, built in radio and navagation, etc. I still believe that Honda quality cannot be beat, at least in my opinion.