Through testing more than 20 top-tier hardshells we've found that pit zips are unnecessary (and therefore a drawback due to their increased weight) on highly breathable lightweight jackets, like the Leashless. The jacket weighs 13 oz., which is heavy for a Gore Active jacket.
The Leashless' main competitor is the Arc'teryx Alpha FL, which weighs 2 oz. less, and (starting in spring 14) uses a more durable Gore Pro membrane--we much prefer this jacket to the Leashless. If you want a jacket with handwarmer pockets we highly recommend either the Arc'teryx Beta FL or Patagonia Super Pluma, both of which (we are confident) perform much better than the Leashless for all-purpose use and climbing. You can compare these models, and all others tested, at the Hardshell Jacket Review.
The Patagonia M10 is our favorite hardshell for backpacking and our second highest rated jacket overall. The Patagonia Super Pluma hardshell won our Top Pick award. There is also a women's version of this jacket: the Women's Leashless Jacket.