Just as a follow up...
I ended up buying the 622c's off Yongnuo's actual ebay store ( http://stores.ebay.ca/hkyongnuophotoequipment
), after checking all the exchange rates I found ordering the ones that are listed in GBP (pounds) to be my cheapest bet.
Ordered them last week on Wed (Feb 20) late at night (around 10:30pm EST)
They arrived 1 week to the day (yesterday Feb 27th)!!
That is lightning quick from hong kong if you ask me!
No problems with customs, no duties, and it was fairly well packaged.
Did a few quick plug and play tests last night and they work beautifully with both my 580EXII and the old 420EX. The 420EX still gave me all the options in the menus which is strange because I thought it had to be EXII's for that.
The only issue I seemed to notice was getting completely blown overexposure when using FEL sometimes. However, I was metering off something reflective so not sure if that was the issue. I will play with that some more when I get a chance to see what's happening.
Ordered another set of them last night!
So recap: Yongnuo's ebay store ( http://stores.ebay.ca/hkyongnuophotoequipment
) is a reliable place to purchase, with quick ship, and on first impressions: BUY the 622c's!