The inclusion of a 3 charging stations for your phone, watch, etc make they very comfortable to use. I contacted with seller several times and I feel like they are trying to refuse me in many different ways. After a long cross country, the weight of these can start to bug you, but I have no problem wearing these for three hours. I bought this shaper about 3 1/2 weeks after my tummy tuck. I was a bit bloated from my dinner before working out and once I worked out with this belt my stomach was half the size because the loss of water weight. I think the xl would have been fine as well but this 2xl fits like a dream! Just make sure you update the firmware on these using the AKG app! Good grip so no slipping on wet floors. They made minor design changes within the past year or two but nothing major. The old ones were made of wood with a leather strap and buckle.