I have the gowearfit- and honestly people I know who have the bodybugg and now have the gowearfit say GWF is better.
One thing that totally attracted me to it is the fact it tracks your sleep. I had a suspicion I wasn't sleeping well and I was right! Once again I'm waking up multiple times during the night (despite having a CPAP) so I'm going to schedule another sleep study next week. Even when I have taken naps in the afternoon it knows!
I also have the optional digital display so during the day I can quickly look at calories and so on at a moments notice.
Some people have issues with having to plug into your computer to check your stuff in more detail- but I'm the computer nightly anyways so it doesn't bother me at all. Though it does store data for up to two weeks if you just don't have time to plug it in. I switch arms daily so my skin doesn't get irritated also.
As far as I can tell it seems accurate- I really have no way to judge if it's wrong or not- but it's definitely motivating to see how many calories you've burned in a day.
I am very happy with my purchase- I definitely know I'm going to do well with this device!