I really can't add anything more about Scher b/c I never went to him. Cotton did, though.
If you're googling & if you look him up for an appt., though, please note the spelling. It's Jonathan Scher, not Sher. Sher is Geoffrey Sher with SIRM. Totally different guy, although both believe in immune issues. (I know I'm repeating myself but I want to make sure you get the right guy if you go to make an appt., esp. since Scher & Sher/SIRM are both in NYC.)
I'm not sure how Scher handles long distance patients. Kwak-Kim will be used to it, though. You might post on the immune group board & ask Canadian patients in the Toronto area what they do regarding drawing & shipping blood.