Sorry for taking a while to reply to this thread.
I'll put up a solid post about my experience soon, but in short, it did not really help my HPPD and other issues (DP, anxiety, depression etc.) Basically the meditation is tough, it's not easy (I didn't expect it to be) and I left 2 nights early (I shouldn't have, it was a really really tough decision to make) so I can't say that I've had the full experience. It was an interesting time and I'm glad that I gave it a shot, and I may go back in the future to try it again, but it hasn't had any long lasting changes in me.