Been using MyFitnessPal for over three months and really enjoy it. I'm sure some of the calorie burning estimates they give you are less than accurate, but it's better than nothing. The calorie intake numbers are very accurate, unless it's homemade food and hard to measure. I've lost about eight pounds over that period of time without changing my workout, though I do walk more. I also have MOVES, which tells me how far I've walked each day, so I add those numbers into MyFitnessPal. Just downloaded AlphaTrainer two weeks ago and have completely changed my workout. I was getting a little too random about my weight training, leaving out a lot of lifts that I just didn't like without consideration of how balanced my routine was. The routine the app recommends is based on my age, height, weight, current fitness state, my goals and how many days a week I will go to the gym. Day one is a killer, 55 sets (mostly super-sets) and estimated at 73 minutes in duration. I do twelve sets on the bench alone, flat, incline and decline. Days two and three are somewhat shorter. Day four is a 23-minute plyometrics routine. I couldn't even finish it the first time. I hadn't done much jumping in a while and not done an interval workout in months. Did much better this week, but I'm still a wimpy jumper. It's a 12 week program that ramps up after each three week interval. It'll be interesting to see where this goes next week. Anybody else using fitness apps or devices? Might be getting a FitBit, or I might wait to see what Apple is working on for 2014. They're deep in development for some type of wearable device and have hired a lot of people from the health/medical devices field.