flare nut wrenches

[Grant Lenahan]

I've been doing a little research on flare nut (brake line) wrenches.

While everyone makes a set, it appears that three stand out because  
they offer some models with patented designs that grip the FLAT sides  
of the nuts, not just the points. These are:

Snap-On (flank drive)
S-K (suregrip)
Craftsman (not named, mentioned on the inch set, but not the metric,  
hmmm)

Does anyone have experience with any of these three, especially vs.  
traditional line wrenches?

Grant