I've used the FEL and a 3ph post driver to set T posts. My experience is;
1. If there are no rocks, you can set the T post with the FEL without any weight in the bucket.
2. If there are rocks, adding weight in the bucket doesn't help, you just increase the odds that the T Post will spring out from under the bucket. Very dangerous.
3. If there are rocks, the 3ph post driver either bends the T Post (dangerous) or it goes in at an angle.
4. To use the FEL, it was best for me to have 2 people. One on the tractor (me) and one to position the bucket above the T post (wife). /forums/images/graemlins/smile.gif Once the bucket was positioned, she got out of the way.