I got two PS by PM after I made my last post in this thread. That was rather unintentional, but since I replied to them, might as well try to help out 😛. PM me your PS and I'll try to give you some basic feedback. I'm not going to edit/revise, takes too much time and not something I am very good at. But, I've read a couple hundred medical student PS as part of an admissions committee, so I can probably give you some pointers prior to whatever you end up doing with it.
I'd look for family/friends/colleagues from work who can read it over. If not, then bite the bullet and go with your old school.
Edit: Okay, I got another PS from someone else and another PM from another asking if I'll read theirs. This is obviously something that needs to be done again, but I'm not going to read anymore, at least not today. Don't have that much time!