Suggestions for Ipad keyboard folio

Got a new ipad4 - looking to get a keyboard folio. I would be using it for doing a small amount of work during travel, as well as email. Would also value something that isn't too thick when folded.

Here are a couple I was looking at:

http://www.amazon.ca/gp/product/B008...pf_rd_i=915398

Kensington
http://www.amazon.ca/Kensington-KeyF...I2DU99OEC8HUGB

Zaggfolio
http://www.amazon.ca/ZAGG-FOLCARBLK1...dp_ob_title_ce


Review for all seem good. The Logitech looks to be a bit thinner, and I like the look of the Zaggfolio but not sure if either are worth the extra cost compared to the Kensington.

Opinions appreciated.