Hey Kmac! I LOVE LOSE IT and have used it and been successful. I have a HRM that I use to enter my own calories burned since it is more accurate, but it certainly doesn't hurt to use what they have, it's been pretty close.
Ummmm, eating back calories. I DUNNO. It depends. So people on these forums (I have asked before) say they don't eat back their calories. I dunno though... It's about energy in and energy out. Jillian Michaels says you should eat back calories, otherwise you are not going to lose weight, ruin your metabolism, plateau, and feel lousy (Or SBD sick).
Example: I do a mix up of 1200-1500 calories a week. So 1200 for 5 days, and then 1500 calories for two days (never back to back). This is supposed to help your body not plateau.
I did two Bikram workouts today. Class one burned 655 calories. Class two burned 720 calories. My Cardio burned 439 calories. Therefore, I ate 1159 calories through natural peanut butter on celery, ff yogurt, beans, salads, veggies, tofu, quinoa, couscous, cabbage, sf fudgesicle, etc AFTER my calories deducted... Otherwise I would be negative calories. Sure, one day won't hurt you, but I worked hard to get my metabolism in gear so I can eat what I want.... I don't want to undo the hard work by NOT eating enough, ya know?
If I don't eat back calories, I would literally be in starvation mode.
I think the important thing is to hit your calories.
Since you have an ipod/iphone, I suggest going to podcasts and typing in Jillian Michaels. She has a new podcast, but her old podcast from a year or two ago is CHALKED FULL of useful information like this.
Most importantly, listen to your body. Sometimes, i struggle to get in enough calories, just Mondays though (Since it's my double Bikram Yoga day- once in the morning with a friend and once at night wiht my husband) and thereofre I get to eat some more "fatty" high calories foods. And by fatty, i mean nuts, hemp seeds, peanut butter, avocado, etc...
Hope this helps. Message me if you want. I do SBD and use LOSE it!