My first race in the Gel-DS Racer 10 was the First Day 5K, in Fair Lawn on January 1st. I have been racing, and primarily training in, the DS Racer 9 for the last year and a half or so. You can read my review of the DS Racer 9 here. The Racer series has been a reliable shoe for me for some time, but I have been over using them for training for some time. The Racers are for what they are designed for, racing. I put a lot of training miles on my previous pairs because they are so light and comfortable, I want to run in them always. However, the shoe is not meant for that and deteriorates faster than a training shoe.
Because of the overuse, I sadly retired my 9's after the NYC Marathon. They served me well and I was happy to stay in the same sneaker line for the next upgrade, the Racer 10. Right from the start, I could tell I was going to continue to love the Racer 10. It is light and comfortable to my foot. By the way, for technical information, go here. I am more of a fit and feel guy, not interested in staring at numbers, heel drop, etc.
The shoe did feel a little softer than the 9's, but that may be due to the 9's being worn out and less cushiony. One of the great things about this series I think, is that they feel like they fit to your feet well. I do not like a shoe that is loose in areas around the foot. Sometimes, even a shoe that is sized correctly, slides around or there are pockets of open space in and around your foot. The Racer 9 and 10 both feel like they feet my feet well and I do not have any wasted space.
Another of my favorite features is that this shoe is light. It is like under 7 ounces for a standard size 9 sneaker, adjusting up or down depending on what you wear. That is really light and you can race in these from a 5K up to a marathon, giving the shoe some solid versatility.
As far as sizing, the 10's fit perfectly at the size 11.5 for me. This is the same as the predecessor. I
wear a 10.5 mostly in day to day shoes and go to the 11.5 for running because of swelling and whatnot. I do not generally have issues with blisters until I get over the 20 mile run threshold.
Asics continues to do things right with this shoe, as it always does.
Interestingly, the DS Racer 11 is available now. However, I like a $50-$60 price tag better than a $110 price tag. You can still find the 10's easily online. I would imagine, next year, after buying these 10's a couple times, I will be reviewing the 11's at some point!