Over the summer i took the sidemount course, my instructor is a big, deep wreck diver who also has a bad back. Summer house in Key Largo too. With that being said he told us alot of people are going the sidemount route who have bad backs. Less weight and less strain on ur body. It felt awkward for me with the tanks on the side, u do have to get used to it. Also doubles on my back is alot of weight and awkward at first too. Im 5’6 140lbs. He mentioned it takes more help in and out of water but as far a penetrating wrecks he feels its easier since u can put one tank inside and then enter, less chance of overhead entanglement as well. Besides doing the pool and open water training dives the day we went out to the quarry i havent used the setup elsewhere. Such as everything there are pros and cons and personal preference but iam seeing alot more people with sidemount setups at the quarry by me.