Strengths: Many features, replaced by a new Polar model, with a smaller foot pod, and increased featurs. Purchased via an online auction site for £145.
Weaknesses: Issues over altitude accuracy, as it always reads a lower figure at the end of a long circuit type run, which is a bit odd, but there is a correction function in the software, to adjust the end altitude to match the start, So not so bad.
Overall: The manual will take about 2/3 reads to understand fully, once this is done, the entire system is great.
The recording interval needs to be set to 5 seconds as adjusting it to 15 or 60 gives inaccurate distance measurements, when set on 5 seconds the pod seems very accurate, giving exactly the same readings each run i do, over cross contry or road. I have not calibrated it but kept the out of box settings and measured each of the three run routes i do via car and internet maps and there all consistant.
The software is very user freindy and records all the information clearly and accuratly, i cant personally see what more a runner could need from software.