I ordered this mostly because the price was dramatically less than comparable shoes ($55 at the time for my size/color) and because I was doing high impact workouts 7 days a week in cheap sneakers and my feet were paying the price.  I'd heard Asics were good for overpronators such as myself and I'd debated and debated and finally took the plunge.  I'm a pretty reliable size 9 so I ordered size 9 but when I got them they seemed a bit snug in the toe box and after reading all the reviews on here about how they run small, etc, I panicked and thought about sending them back.  I tried on lots of shoes in the stores and ultimately decided to keep them.  I'm so glad I did.  The 'snugness' in the toe box disappeared while I was *walking* to my first workout in them.  Lunging, turning, jumping jacks, ski step, hops, skipping, droppin' it low - all on little clouds.  All my previous foot pain is muted.  I love them!  I can't speak to long term durability because I've only worn them through 2 workouts (zumba and kickboxing) but I say they are true to size and very good for jumping about.

UPDATE: 3 months later - with high impact workouts about 5 times a week - these shoes have held up very well.  They haven't totally cured my plantar fasciitis, which still gives me pain sometimes - but they have helped a lot.

*** 8 MONTH UPDATE *** So I have loved these shoes, as you can see above.  But the springiness has definitely diminished after 8 months of use.  Also, on both shoes a small hole has started near where the little toe is, where the seam is.  True, I work out pretty often - I'm probably averaging 5 times a week these days -- but I only wear them for workouts and nothing else.  I just think they should last longer than 6 months... so I'm changing my rating from 5 to 4 stars.  Just more info for you.

>>>> UPDATE TO THE UPDATE <<<<<<< So, I sent my 8 month worn shoes back to Asics and within 3 weeks they sent me a brand new pair of Gel-Craze.  I'm stoked!  Way to stand behind your product.