I've been riding the 2007 for almost a month now and I have about 750kms on it (about 450k with a freewheel and 300k fixed)...Other than the addition of front and rear brakes and an ACS freewheel, a swap out of the handlebars to 44cm Bontragers and a San Marco Regal saddle, my bike is stock...
The EC70 fork is great...I'm sure the new version with the carbon steerer will only be greater...The most pleasant surprise has been the wheels...They came from Jamis severely undertensioned but the mechanic who built up my bike for me spent the necessary time to tension them correctly and it's really paid off...I'm not a skinny man, and I have been known to carry as much as forty pounds in my messenger bag...I've pinch flatted over a giant pothole...I've ventured offroad...The wheels are still perfectly round and within a millimeter of true laterally...I guarantee that wouldn't be the case with a low spoke count set of wheels such as those that come from the Trek Corporation...
If you're looking for a fast, tough as nails, fixed gear bike for the road, the Sputnik is it...
I'm happier with it every time I ride it...
If you live in or around Toronto, I couldn't recommend Cycle Therapy on Queen East enough...They did a fantastic job of setting my bike up for me and they did it at a great price...I wouldn't hesitate to go back to them even though I'm a 150km bike ride away...I really believe that a bike is only as good as the people who build it up for you and I think they are a key factor as to why the Sputnik has worked out so well for me so far....