I have four pairs of Tieks and find them generally pretty comfortable, although not as life-changing as their website would make you think. I've found that because they're handmade their sizing differs a bit from pair to pair so you really have to try several pairs until you get one that fits you right. But they are very, very cute, look great with dressy outfits and workwear, and are an acceptable way for me to look really put together without having to wear heels. They're also super easy to travel with.
Oh - and for those who are considering buying them, I've found the patents to be MUCH more durable than the regular leather ones. They all hold up just fine, but you have to be super careful about not getting the regular leather ones wet - I have the poppy color, and every time they get a spot of water it totally shows up. The patent ones don't do that, and although I wouldn't wear them in a rainstorm I don't mind if it's slightly wet outside. I need to buy a size larger in the patents than I do in the regular because they don't stretch.