Have the Polar 625sx, but the footpod has not been accurate.
Marathon training with the FIRST program, which emphasizes pace per mile.
Best solution for accuracy? Stay with polar footpod…looked at their G1 GPS, but reviews are not good. For the same $ could just go with a Garmin 305, but clunky, and do like the Polar for HRM. Reading about Suunto, but pricey.