I don't know how much differnce it makes,but I'm sure it must make some! I try and go on it most days,for between 20 and 40 minutes, I don't come off feeling like I've been to the gym,but it's 20-40 minutes that I would normally have spent sat on my bum, so I must be burning a bit more fat than normal!!
I've only really being doing it for the last couple of weeks, but I would think it has to speed up weight loss a little........and it's quite fun!!