How far into the epidural space do you thread your epidural catheters when you place them for labor analgesia?

@ what level do you try to place them?

What factors do you take into consideration? Patient height, level placed, what else?

In morbidly obese patients, do you shoot higher than you would in a patient w/easier anatomy? If so, how high are you willing to go, & if you do go higher, then how far do you thread your catheter?

Do you adjust pump rate according to level placed & patient height? What guidelines do you use?

I'm convinced I've seen it all.

What's the "best kit out there"? Is there a huge price difference between various kits? Anyone know?