I haven't voted. Either way, I'm supposed to say something here, and I find the question ambiguous, especially given that the responses can go either way: important to me, or important for the snake. So, my response given the possible meaning of the question:
I like to have Clyde constrict, but he's only done it twice in the 11 months I've had him. He won't constrict something lying in the feeding container, and I wouldn't dangle pinkies for fear their tails would just pop off, so it has only been with fuzzies. It's not really important, but it is significant enough that it is a goal with each feeding. Now he's on two fuzzies, and one time I dangled the second one in front of him, and he just followed it around with his snout. After a couple of minutes of this, I gave up and held it still for him to grab. He grabs them quite firmly though, and I love his feeding-frenzy mode with the second one. He crams it down as fast as he can even if I dropped it and he just has to pick it up. Kathy said her Okeetees were the best feeders of the lot (thanks, Kathy!).
As an indication of quality of snake by any reconning, I don't know, and I would not be inclined to worry about it. You get a lot of opinions here, but not so many statistics on this sort of question. Seems like there are plenty of other concerns with the little guys w/o adding worries about whether he should lunge before eating, I figure.
-Sean