I only have one brakeset with spring loaded levers. My Mavic SSC 440 brakeset made by Modolo.
I haven't mounted them to any bike yet, but I suspect that combined with the smooth action of the calipers, which I think actually emplys bearings at their pivots, the brakes should have a very light and maybe very precise feel to them compared to my other brakesets. Only thing I'm afraid of is the possible tendency to grab a hard handful of brake and going over the bars the first time I use them, as the light feel might not give me that progressive action that I'm used to.