The full zip is excellent for getting in and out of them quickly - well worth the extra cost. They are very light and fit over jeans easily. I got them mostly for tailgating and football games since we've had some wet ones, and they've kept me dry every time. I haven't had a reason to use them on any hikes, but they pack away nicely in a day pack, without taking up any space at all.
Recently I went on a 2 hour hike and in Oregon fashion it was raining the entire time. Back at the car I peeled off my Arc’teryx jacket to find typical dampness from trapped condensation, no big deal. On the other hand my nylon pants under my PreCip rain pants where completely soaked. It seems to me that using the descriptors “PreCip® Dry Touch Technology, Waterproof/Breathable” and “100% Seam Taped - For Full Waterproofness” are incredibly misleading and could lead to tragic situations if someone was relying on these claims to keep them dry (thus warm) for longer then a day hike.
This is my first product from Marmot, and it is quality. The breath-ability and water resistance are amazing, and it is extremely light weight. The full length zips are great for removing them when wearing snowshoes or crampons. They look very clean and stylish, but not to trendy, which is good so you don't stand out too much when climbing a mountain because the other guys will make fun of you for trying to look fashionable in the middle of nowhere even though they're really just jealous.