11:59 p.m. on August 25, 2009 (EDT)
Gore-tex boots are popular primarily because the gore-tex takes all the skill and work out of making your boots waterproof, both for you and the manufacturer. It also lets the boot maker off the hook in terms of not having to use more costly construction methods and materials.
Many gore-tex boots are made from multiple layers (scraps) of cheap leather with hundreds of stitch holes and stitching, to hold the whole thing together. This makes these boots more affordable. Although this gives them more initial flex with less break in time, their only saving grace in terms of water-proofness is the gore-tex liner. The boots made of suede tend to be more porous, and if not sealed they will absorb water/mud making them heavier, which also leads to the breakdown of the leather.
Just put them on, break them in if needed, and your off without a care in the world...right?
Not exactly, gore-tex tends to be hotter causing your feet to sweat more. This means you will probably have to change your socks more often during warmer months. Gore-tex does not work well if the liner becomes dirty, it looses it breath-ability.
Gore-tex boots take much longer to dry out if water comes over the top of the boot. The multi layered types are not a good choice for areas where they will be abraded by rock or scree, the stitching comes undone and you have to glue the pieces back together. Hot melt glue or shoe goo works well for this.
They are however cheaper and easier to waterproof (mostly done for you with the liner) and generally have a shorter break in time.
After many pairs of boots I now prefer full grain, one piece leather boots with welted (stitched on) soles. I like the welted soles because they give you a wider sole, when necessary they seem to kick into dirt slopes better than rounded over glued soles. You do have to make sure to work the water-proofer into all the stitch holes or use stitch seal, if you do that you're good to go.
This type of boot construction offers thick leather for durability and support, very minimal stitching in the upper, and will take about anything you can throw at them in terms of terrain. Full grain leather boots tend to have a higher level of craftsmanship than cheaper boots. They dry quickly if you should get water over the top, and stay cooler in warmer months. This type of boot should last much longer than cheaper multi layered, over-stitched boots.
The down side to FGL boots is that they are getting harder to find, they are more expensive, and generally have a longer break in time. They do require you to learn how to do your own waterproofing which is a maintenance thing, but that can be enjoyable, like polishing a fine hand built sports car.
This has been a gradual learning process for me, twenty years ago I would never have bought an expensive pair of boots that had to be broke in. Now you couldn't take them from me.