The old Warts are the best, don't even buy the new ones by Rapala. The new Brad's Wigglers are really an exact copy of the old Wiggle Warts.
As far as how to fish them, I will back-troll them in the rivers. The Wiggle Wart will dive to 12' or so. The Mag Wart will dive to 18', this is all depending on the amount of current etc. They are also very good trolling them in slower water areas, like up @ Wind River. The Mag Warts are the favored lure of choice for most people. Just tie them direct to your line, let out 50-60' of line and slow troll. They are great for Salmon and Steelhead, Good Luck!!