Chris C.wrote a review of Castelli Climber's 2.0 Full-Zip Jersey - Short-Sleeve - Men's on July 10, 2015
Familiarity: I've put it through the wringer
Fit: Runs large
This is my second Castelli Climbers jersey. It is in some ways improved upon the first version, although in summary this iteration misses the mark.
The problem with the first castelli climbers jersey was that is was too broad in the waist, and despite being a form fit in the shoulders, it has way too much fabric in the chest/torso.
The new version fits better in those dimensions, but it is significantly longer than the first version, so it too bunches up at the waist. Because the fabric is even thinner than on the first version, anything at all in the pockets cause the back of the jersey to sag down toward the saddle. Unzip this jersey and your cellphone/gel/credit card/ etc. will bounce around behind you with each pedal stroke and sag the jersey down even further. I'm sure this jersey was designed for racing, when riders might not carry anything but a gel or two, but it doesn't seem like a big ask that the jersey be constructed in such a way that one can carry a couple minor items on a long ride.
Another nit to pick is that the zipper is too skimpy, and I doubt it will have a decent lifespan. It can be difficult to operate even in simple circumstances. The broad toothed zipper on the climbers jersey 1.0 is a worthy weight penalty as it is easily operable while riding and it will clearly last many seasons.
all of this is a bummer because the jersey is such a pleasure to wear on a hot day in the mountains, so long as you don't unzip the jersey and you don't need to carry anything.