Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great system, but requires an investment

The Nike+iPod system works great and without a hitch, but to join the club, you need a $150 iPod nano, this kit, and unless you have just the right shoes, either some new Nike's or a third party accessory to tie the sensor up to your shoe. This kit is very durable; once, the sensor shot out of my shoe and landed in the snow. I didn't realize it for like 5 minutes. When I came back, I just popped it back in and kept running. The thing's really well built. While the kit works, I would've liked the Nike software on my computer instead of on the internet, and I would've liked better battery performance from my nano while I'm running with the kit. The receiver eats batteries for breakfast.