yeah, doing 5x5 with supersets, or HIIT or full body training, your metabolism goes through the roof. basically, you're raising your bodies growth hormone output, which shuts down as soon as you take in too many carbs at once. how many carbs that is depends on your body. pre workout carbs are fairly important, and post workout protein and mono fats are important as well. its not fun, but it is a way to cut a decent amount of body fat, while gaining a small amount of muscle.
the gains in muscle won't be huge, but should be noticeable (around 2 lbs muscle per month). the benefit is you're not doing a traditional "cutting" phase, where you loose fat and muscle.
the reason people fail in this workout is they don't realize how fast you should be getting in and out of the gym. think 30 minutes as a max time. also, your pulse should be over 150 without any cardio. lastly, you have to limit carbs post workout.
combine that with an early morning run before food/juice and you'll see progress pretty quick.