I am currently doing this on myself at home using bags of saltwater that I cool to 1 degree in my deep freeze. I did this for the first time two days ago and so I have not yet seen any results. If you read the studies, the only variables involved are temperature and time. There is no reason why my free technique should not work as well as the £900 commercial version.
The commercial version sucks the flab into a concave devise, which increases the surface area slightly. I doubt that this significantly increases the effectiveness of the procedure.
The commercial version maintains a constant temperature. This can be replicated by replacing the bags of saltwater ever half hour. Apoptosis is stimulated at a range of temperatures. As long as you keep the temperature between 1-10 degrees this will work.