As the Colonel mentions, it is a very efficient wing, so it can only be good news for the beancounters.
From a pilot's perspective, I'd say it is quite hard to slow down, so requires a bit more planning ahead as the speedbrake is only really useful at higher speeds.
I've flown with guys on the 700, who have come from types such as the 777, 744 and A340 and they all say the 700 is the trickiest to fly.
Apparently the speedbrake on the 777 will double your descent rate. . .
That said, I enjoy flying the 700 as no approaches are rarely the same in it.