The definitive mid-2016 Fitbit buyers' guide

My February 2015 “definitive Fitbit buying guide” is no longer so definitive, as Fitbit has released two more trackers since then: Alta and Blaze.So here’s an updated buyers’ guide to Fitbit’s current lineup of products, based on my own experiences using all the devices. I’ve arranged them from least to most expensive.But before I delve into the trackers, three things are worth mentioning.1. You don’t need a Fitbit device to track steps with Fitbit. The