I bought it new for my son during lockdown from a guy that needed to unload it. It was broken within 2-3 practices and mobility is excellent. Keep in mind that during practices he gets way more shots than during games. So if you play games only, it might take longer. He loves it and he likes the peace off mind of not having to worry about any pain. After a year of intense use, the protection hasn't changed and i can tell this will last a long time.
As far as the weight goes, I wanted a baseline measurement during the off season when they unit is bone dry. He is practicing almost everyday and sometime twice a day, so monitoring if the unit has time to dry and doesn't become waterlogged seems likes good idea. I was also wondering if salt from sweat could build up to a significant degree.