Does anyone have any real experience with using FitBit or any other monitor for weight lifting. I'm interested in tracking calories burned without guessing.
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Short answer: NO
When you are weightlifting, the following is true most of the time:
The long story short, a pedometer is very ill suited for strength training. You can get a better picture of energy expenditure and calories burned by using a heart rate monitor. While this does have it's own challenges, particularly when the bar comes in contact with your chest, the information you get from the heart rate monitor is much more useful. You do need it calibrated for your current level of fitness, but even with the rough ballpark estimates it will be much closer than a pedometer.
I wrote about using a heart rate monitor back in 2011 for weight training. While it is useful, I only break it out now when I have target heart rate ranges I'm aiming for during training. For example, if I want to build my aerobic performance while weight training I will try to maintain a heart rate of 120-150 bpm.
For your specific task (calculating burned cals), no matter what fitness band you choose, it's still a calculation to figure out how many calories you've burnt. With any calculation, there's a level of tolerance and you need to be able to accept the tolerance. If you're just worried about the number of calories burned, you could calculate it yourself and be pretty close.
With that said, a fitness band is an awesome accessory to help you reach your goals. But what are your expectations? Your question is regarding weight lifting, but your inner question is about calculating calories burned. For weight lifting, you'll find almost no benefit from the FitBit Flex or Force - but they may be helpful for overall fitness.
Some of the most important metrics (IMHO) are missing in a lot of them - such as temperature and heart rate. Buying a band now instead of later may mean that you're just going to buy one later as well as you'll want the features of the newer models.
I won't try to regurgitate the information in some REALLY good blog posts about the subject, so I'll link them here:
As mentioned in my comment, I'm extremely excited and waiting for Amigo - probably to the point that I won't buy one until this comes out or one comes out with these features.