Well, I would have liked to review their "self heating lower back support", but I can't. Because I never received it. Placed the order on 25th May, sent an email asking about the order on 9th June, nothing has happened. The only swift measure Dynergy appears to be capable of is taking your money, that was done minutes after the order was placed. I guess I'll have to write off the £33.98 this cost me. Not a huge amount, but I reckon it will help Dynergy's profits, charging for products but never dispatching and delivering them. So take my advice and stay away from this company.