Getaway = the win.
Getaway + sprint = 100% speed increase + Gnomish stilts = jumping from blood haze inn to the broker building.
No other classes aa's give you something that cool!
On a positive note I find Getaway to be useful enough, when concealment chains break or the mob breaks you invis before you can get a skill off, its useful enough for me.
Besides... you have to get quite a bit of stuff in that line, so its not like you sacrifice much to get it.