Hi Brenda!
I did get most of my questions answered, so I have summarized what I have learn here. Check out this great link that shows the differences between all of the devises:
http://www.bodymedia.com/prodtbl.html . According to this chart, all three give you your "Calorie Balance" (weight gain or weight loss trends), although since the GoWear Fit has a 3 Day Nutrition Assessment instead of a continuous food log, it gives you your "Average Calories Consumed" instead of your actual calories for the day. It looks like all of them include personalized target and goal setting and reporting.
For me, it was between the BodyBugg and GoWear Fit, I just couldn't justify $350 for the Sensewear. I ended up going with the BodyBugg because I could log my daily calories. I must say that I was disappointed when I got the devise, as I didn't care for their food log and that was the main reason why I picked it over the GoWear (with the sleep monitoring), although there are plenty of happy BB users our there.
I have added some attachments so you can see what the food log is like for the BodyBugg. At first look, it looked good, but then I tried to use it...a whole different story. It suggests a daily menu plan for you, which is nice, but if you want to change it, it is a big pain. In attachment 3, it shows you how you can change your food choices for your menu, but for some reason, some of the words are cut off and it cannot be fixed by maximizing the screen. Also, once you click on a food, it assumes that this is your final choice and all of the other options disappear, which makes it difficult to search for items if you want to make sure the calorie count is right before selecting it.
In attachment 1, I put a red circle around the "Calories Consumed" button. The first attachment is only your plan, you have to separately input your food as shown in attachment 2. If you actually ate what is on your plan, you can put "I ate my meal plan", but if you did not, then you have to manually log everything in, although at least in this window the words are not cut off. Once you enter your calories in this section, it does not look like you can change them, so you can only enter them after the fact.
In short, the BB food log has the fundamentals, but it could really be a lot more consumer friendly and was not all that I hoped for.
Regarding sleep monitoring, the BodyBugg will tell you how many calories you burned while sleeping, but that is it. The GoWear Fit (and Sensewear) tells you calories burned, but also your sleep duration and how efficient your sleep is.
One other nice feature of the GoWear Fit is that it has 2 activity levels, where as the BodyBugg only has one activity level.
Regarding pricing, there are two good specials that are going on right now. On Amazon, you can get the GoWear Fit for $199 (until Jan. 31) with free super saver shipping, and as of Jan. 19, it is no longer on back-order. It comes with a 3 month subscription. With 24 Hour Fitness, you can get the BodyBugg for $249 with a 6 month subscription, and this price is a "limited time" offer. Both prices quoted include the digital display (thanks Beloved!).
Hope this helps!
** UPDATE 2/20/09 - the GoWear Fit now offers the option of a 3 day assessment or continuous food logging **