tension consistency > beingtrue
Sheldon Brown's site has a wheelbuilding page that discussing evening the tension by plucking spokes.
An earlier poster mentioned that 15-25 is an acceptable range with the TM1 tension readings, but I've built 5 wheels in 6 months with mine, and they are all 20-21, or even a little closer...
They do have up to 0.5mm wobble in various directions, but I'll never feel that on the road, and they'll never move off it with such even tension all the way around.