I bought to AP on Wednesday. Got upgraded to 2019.5.15 that evening. SOC went up with the upgrade without charging. Currently at 290 miles/91%. I need to tap it down a smidgen to get to ~ 90% SOC. While 5% power is a nice increase, I really have no way to validate that came with the upgraded, but as the improved efficiency and power are related, I'd assume the 5% power increase was part to the upgrade.