Have last years model (the one Karl G reviews) and just got the newer issue. They fixed every complaint of his, and then some. Button is hidden on the sleeve, and works perfectly (never really had a big problem the other way, but the update is a plus). The venting is no longer an open mesh panel that you can get caught on the wrong side of (hated that as well). Also added an extending flap for additional neck coverage on the collar, shaped the cuffs for better hand coverage, and tacked down the outside edge of the pockets where they poked out on the last years version.
Super lightweight and quick drying. The fabric is a really soft texture, feels great. It looks good in the office and works in the backcountry. Will be getting a couple more.
To get 5 stars, columbia needs to add a bit of stretch, either in all of the fabric, or maybe just in specific panels. Add a odor/antimicrobial finish to the shirt. Id prefer a small snap instead of the velcro on the pockets