I can vouch that the original one works as written, but I would go the DCM route if I were you. The reason for this is simple, the amount of acid needed is greatly reduced, and the yeilds are much better. SWIM tried to get the DCM/peracetic route to work prior to Chromic's work on it, SWIM wasn't lucky with the modified(DCM) version. But remember that SWIM hasn't personally tried it out since Chromic's writeup. So to recap, they both work but use Chromic's writeup, the other one was more of a proof of concept type of thing...