This has been a somewhat interesting thread to read, given that I own an '07 LT.
First off, '07's did not come with stainless steel brake lines. I replaced mine with Speigler lines last summer. The cost of doing it yourself (and there is a lot of information and videos on how to do this) cost me probably $275, parts included (fluid and lines).
The final drive failures appear to have been more prevalent with the early models ('99 - '04?).
Many owners have had a weep hole drilled to allow a leaking seal to drain away from the clutch plate. This also serves as a warning sign of the need to replace the seal if you see fluid dripping from under the bike. I have not had this done on mine and the clutch has been fine for 46,000 miles.
In relation to the servo-assisted brakes, as long as the bike has been serviced regularly, including changing the brake fluid and bleeding the system every couple of years, it should be fine. However, if the servo unit goes out, a new one costs about $2,300, excluding labor. Some people that have had this happen, plumb around the unit to bypass the failed part. Earlier years bikes have a unit that has been successfully rebuilt, but the high priced unit cannot, from what I have seen/read so far. There are a couple of companies (one in the USA, another in Germany) that claim to either working on a rebuild or have done a successful rebuild/repair.
If I were to buy another LT, I would stick with the '05 - '09 versions, as they have the electric center stand, revised suspension geometry, and a little more horsepower.
Things to look for when considering an LT are a record of regular maintenance; how clean it is; mileage (don't necessarily get scared away with a higher mileage bike if it has been well maintained); and price.
- Stainless steel brake lines
- weep hole already drilled
- metal quick disconnects installed on the fuel tank lines
- Fit-It-Before-It-Breaks top case latch kit installed
- aftermarket seat
- low mileage tires (make sure the rear is marked "Reinforced")
- has it had a canisterectomy (bypassed charcoal canister vent line from the fuel tank, canister is located underneath the top case)
Hope this has been helpful. This site contains a wealth of information and many people with expertise willing to share their knowledge with any problems or questions concerning LT ownership.