I have the 2009 IS101, but I cannot compare with the 2007, since I've never had or tried it.
To me it feels pretty fast.
I have my footstraps extreme backwards and my mastfoot a little further to the back c/w the recommended position.
I still consider this board as my best board I've ever had. It's a real chop killer.
The 2009 has 97L, while the 2007 had 96L of real volume.
I've compared once the IS101/2009 on the same day with the Falcon95/2009 and found not too much difference in top speed, BUT the Isonic was far superior in the chop, i.e. much more stable, which probably makes me faster with it.
IS87 / IS101 / RRD114 / US147