I have a mid-2012 (i.e., the first ever base model) 15" mbpr with an SSD that is full. Can anyone tell me what the options are on upgrading to a larger SSD? I'm sick of waiting for Apple's slow ass to introduce new MBPs -- the current models seem to be mostly the same as what I bought almost 4 years ago. I'll just have to upgrade the size of my drive. Last I checked a couple years ago, getting a Transcend Jetdrive was one option, but it's around $500 for 1TB and it did not offer Trim support which may or may not have been an issue. Have superior options arrived on the scene over the last year or two?