When these launched in '10/'11 they were horrible. Motorola failed to deliver the wireless H.R. headphones, and had no chest strap option yet. It was a $300 pedometer! The company they contracted to rep the device in the L.A. area gave misinformation and generally were "pretty faces" with no technical knowledge, we often had to correct them! As a result we didn't sell it to our customers. We hated it!
Luckily, Motorola kept the firmware updates coming and slooowly over the next year it got better and better. Unfortunately, by the time they got it right it had failed publicly, Garmin continues to rule and the Motoactv was discontinued. Although its no longer in production, the current firmware version N8 is solid and resolved all major issues (battery life). They also still support the motoactv site which serves as the "cloud" for your nightly sync, and are responsive on the user forums.
So, if you're still reading should you buy this? Wholeheartedly YES! I've had mine for 5 months (replacing Timex race trainer, Polar FT7, Garmin 305 & 610), I wear it all day every day (using the clip accessory on my belt). It tracks my daily movement ala fitbit (pedometer is accurate) but also combines that with my daily workouts giving me a very to robust view of my daily efforts. It syncs nightly to the motoactv site so you have a daily & monthly record or your fitness. Individual workouts are recorded when you start that function, & when paired with an Ant+ H.R. monitor you get a great array of reviewable data also available in graphs and charts... It's a great fitness tool period, and when worn daily delivers more data than anything else on the market currently.
I get three days per charge with 1hr workout (insanity) per day w/ H.R. but no GPS. GPS sampling rates can be toggled out to every 3 seconds to prolong battery on long runs or rides. There are 40 different workout modes (run, bike, aerobic, etc) which tailor the way calories are counted. The only thing I don't use is the mp3 player, it works though, but no idea on what it does to battery life.
Again, bottom line, it was horrible at release, firmware updates fixed it, hands down more features than anything in its price point, as reliable and accurate as Garmin but does more for the $.
Who its for, anyone anything land based (run, walk, skate, ski, cross fit, weight train, anyone who moves at all during the day)
Who its not for, swimmers.