I picked one of those shirts up as a souvenir when I was in Edinburgh earlier this month (got the long-sleeve home Hibs shirt, too). I like the Ajax-like style of the shirt, and it's very comfortable to play in. Seems to me that, in general, Umbro's making some of the most comfortable shirts these days.
That's almost worth getting just because of the sponsor. Boy, I could have used a few of those last week while I was in Colorado.
http://www.footballshirtculture.com/200808211795/sponsorship/livingston-announce-rdf-shirt-sponsorship-deal.html
Overall, I am impressed with the look of Scottish kits. The standard over here in MLS can get pretty low.
the brazil was their away last year. i can't imagine they would keep both home and away shirts from last season. they're probably just keeping the brazil to use just in case this season.
and here are some better pictures. the argentina is away, while the brazil is third. actually does look like they updated the brazil style from last season with the new nike brazil/celtic away design.