Fitbit Flex Repairability Score: 2 out of 10 (10 is easiest to repair)

Solid waterproofing, no moving parts, and lightweight construction make the Flex a very durable device, with the potential to last a long time.

The wrist strap is similarly constructed and can be easily replaced.

It's impossible to open the device without destroying it or at least compromising the waterproofing, making internal repairs infeasible.

The Flex's inaccessible (and non-replaceable) battery limits the life of the device.