In my truck I run a Detroit Locker in the rear, and a T-Locker in the front. I went with the detroit because well they will not break and they provide great traction. I have run them in jeeps to and I have no complaints. Yes they do clunk a bit but most lockers do make some noise anyway, I just got used to the noise but it may bother some people.
The T-Locker is also as tough as nails and built to last it is air actuated but not like the ARB is, it is closer to the way the OX locker is actuated.
http://www.pirate4x4.com/tech/billavista/PR-T_locker/In my experience welding the spider gears (Lincoln Locker) works great for traction, but as a former trade welder I know that its a time bomb waiting to go off. While you may get by without it ever breaking it will eventually fail, this is because the spider gears are hardened steel. This makes it impossible to get a good long term weld, by welding them you will also make the steel brittle. I do like the Lincoln Locker but it would worry me for reliability, but it is likely it will never break on you.
I agree with having to change your driving style with lockers, especially if you live in a climate that you see ice and snow. Lockers in the rear are a bit of a change when driving in snow, but the front locker in ice and snow can be dangerous if you are not ready for the big change in driving characteristics.
