Playing with friends wrecked my SR and I thought I'd have to go through dozens and dozens of hours of ELO hell to get it back, but after finding this site as soon as the booster got on my account he got a winrate I didn't even know was possible when solo-queuing as support (22 wins out of 24 matches) and got my SR back up to where it was in no time at all. Friendly communication every step of the way too.