Jawbone UP3

Sleek, attractive design ; Useful smart coach ; Strong third party app support

Clasp regularly becomes loose but addressed with new version ; Difficult to switch between tracking modes ; Some ocassional syncing issues

Even with the extra features added by the latest firmware update, the Jawbone UP3 has a fundamental flaw with its design and that's really disappointing.

More secure design ; Impressive UP app ; Good sleep tracking

Sensors underused ; Expensive ; Awkward charging mechanism

The UP3 is an impressive feat of engineering, but doesn't deliver with its inclusion of extra sensors and beefed up price tag.

Stylish ; slim ; discreet build ; Good step and sleep tracking ; Not bad battery life

Dodgy charger and clasp ; Doesn't track much else ; Feels overpriced

Great design, good battery life, brilliant app platform, superior sleep tracking, lots of extra features, accurate step tracking

Activities requires more user input than others, only resting heart rate, doesn't always recognise when exercising, fastening not as secure as competitors

The Jawbone UP3 is a great device for the Average Joe, one that can be worn all day and night, but it isn't necessarily going to be the best suited for everyone. It comes down to what you are looking for in an activity tracker.

The UP3 adds a few extra features over and above the UP2, namely the ability to track resting heart rate and REM sleep. Is it worth the extra £40? Only if you really want those features. Don't forget that neither the UP2 nor UP3 can track height...

Eminently wearable ; Intelligently integrated data handling and delivery through partner app ; Unobtrusive in form and function

Splashproof, not waterproof ; Fiddly strap clasp ; Frustratingly short charging cable

A truly wearable wearable: meaningful motion data in a sleek and stylish package

Comfortable design ; Consistent battery life ; Rich, varied activity tracking

Awkward clasp ; UP app can be slow ; Dietary information entry is tedious

Compact band design; one-week battery life; fantastic fitness app for coaching and lifestyle tracking.

No on-band display means you need to check phone for stats; band clasp difficult to adjust; heart rate limited to resting heart rate and sleep tracking at night. Can't be worn swimming.

The Up3 is one of the smallest super-slim fitness bands around, but its lack of a display and limited heart rate tracking aren't worth the high price.