I just put in 1.3.6 last night, had 1.1.5 from Sapphire 1.1.1.
Was easy enough to install fm market, and restore settings I already had backed up.
Replace widgets and was good to go. Only thing that threw me was that I could remove the launcher middle button (action button) but couldn't get it back.
Then, figured out why - if you select to have the trash bin at the bottom WITHOUT the resize desktop option, anytime you long press it (trash) will cover the action buttons. Changed to bottom with shrink desktop and am good to go!
Loving it so far, figured I'd missed out on several changes long enough