Well i've completed 2 runs with nike + shoes and overall I think the kit is great, although i have noticed some discrepencies...
1) At the end of each run there is a 'flick' (when viewing the run on nike+ website) which claims my pace has increased to 1 minute per mile

It doesn't affect any of the averages though.
2) The second run i did at 9.30pm, it says this on the nano. However, on the nike website it says 2.30pm, so again

The first run I did is shown correctly on the website so it can't be a time zone issue.
And 3) The distance goal seems a little odd, when trying it out for a 5 mile target, i ran 1 and then synced up, however the site only shows that i have run 0.6 miles.
Anyhow, overall the accuracy is still ok and when these small problems are worked out this kit will be absolutly brilliant. Hopefully i've had the last of the issues.
I certainly will keep using it.