FYI: The YYS should be available to purchase in Canada.
I purchased a 3UG5 version, strung it myself with Ashaway Zymax 66 Fire at 27 lbs (26 x 28.6) and played with it for a few hours. I liked the racket quite a lot actually. It's quick and noticed that i was getting too much angle on my smashes such that it ended up into the net. It definitely lacks the punch of my JJS but makes up for it in racket speed for defense and fast exchanges.
I predominantly use a 3UG5 Meteor X JJS (own 6) for MS, MD and XD. It's the perfect all rounder for me (and still is as i kept wanting to come back to the racket as i was testing).
After playing with the YYS, if all the strings on my JJS' broke I would use the following in this order for doubles:
JS YYS > TK9000 > JS10
For singles:
TK9000 > JS YYS > JS10
In summary the following is just my own opinion and based on me owning 3UG5 TK9000 & 4UG5 JS10:
Racket speed (fastest to slowest): JS10 > JS YYS > MX JJS > TK 9000
Power (hardest to weakest): TK 9000 > MX JJS > JS YYS > JS 10
Stiffness (most to least): JS 10 > MX JJS > JS YYS > TK 9000
If i never played with the JJS, I think the YYS is definitely a great racket for someone looking for a racket that's straight down the middle in terms of Victor Specs. I know there's a lot of BS12 fans here, but i want everyone to know that I'm in the minority and dislike the racket in general (I prefer the LYD cause it has more punch!)
Personally, I'm still eagerly anticipating the TK9900 to be available again in August/September (hopefully) as i really want to try this racket out.
Hope this helps everyone here, since I'm not good with racket reviews and prefer posting about stringing instead