I just installed one yesterday on a Slim (July MFR) had a 0401 drive and was locked, extracted the key and changed the PCB, they have fixed the color issue, now they correspond fine.
I just flashed it with C4eva's stock-0401.bin but when LT3.0 for slims arrive it'll be a simple plug in of the USB from my laptop to do the flashing (it auto unlocks and locks), a flash takes a little longer than in JF, but you don't open anything up.
I hated opening the Slim, it was my first Slim mod but I don't want to ever do it again, now I won't have to (as long as it runs smoothly).
Just know this, their double sided tape is rubbish, doesn't keep anything in place as it should, I substituted their double sided tape with blue-tac, FTW!