I used a Leek as one of my primary EDC knives for years, and never had a problem with breaking the tip off. If you are not using the knife for a prybar or screwdriver, I honestly don't see why it should be a problem.
I have several Leeks, and the speed of opening seems to vary from knife to knife. My old 13c26 is lighting fast, while my composite is probably the slowest of the ones I own (although still fast enough for my use). If it is too slow, its not too hard to adjust the tension on the pivot or add a bit of dry lub to speed it up. As far as the thin blade being a drawback, again I don't see it for any reasonable cutting chores. Sure, its no good for battoning blocks of wood, but mine have cut everything I have asked them to, from apples to heavy plastic clamshell packaging.