i personally use roll form taps with everything i do... sure it takes 3 holders to spot, drill and tap but youd be hard pressed to find a better tap for longevity
i like the feature that mazak added into their m640 where you have a full retract style tapping so you can take depth cuts with a tap for chip clearing... i dont know if any other companies offer this because ive worked solely with mazatrol for the past 5 years with only a little fanuc turning and fadal milling experience prior