Yep those are the ones that I have. I have two sets. A small set and a medium set. And let me just say... the mediums are HUGE!!

So I mainly use those for at night when I was dealing with that initial balancing of the supply and would get engorged. It's always lovely when the baby decides to sleep a little longer than usual and you wake up with a rock hard boob.

When you size them, measure across your breast. Look to see how big they really will be. I thought the mediums were the right size but really the smalls are. They are larger than a typical breast pad (so if you are use to disposibles they will seem gigantic at first). They are suppose to cover more breast surface than disposibles which are only there to absorb milk. The wool ones are also suppose to keep the breast tissue "warm" to help bloodflow and minimize duct clogging. They don't "feel" hot or anything because they are breathable.
They don't shift at all. At least mine never do, the disposible ones even with the sticky strip always seemed to shift on me. Very annoying. I think it's because the wool is a little bit fuzzy that it kind of "clings" to the bra material. They are NOT scratchy or itchy feeling and I'm really sensitive to that kind of stuff too.
Honestly, you only do need two sets. And check out the factory clearance section, they have 2 sets and a bottle of lanolin wash for a great price. And if you plan on more than one child, they will last forever too. I've had my pair for over 2+ years. At first glance, $14 a pair might seem expensive but add up how much a box of disposible ones cost and how often you have to buy them. Gets $$ really quick.

Quite a few of the Mama Pads WAHMs also make breast pads and some of the Diapering WAHMs too. They usually move any threads from the Diapering forum about mama pads and breast pads to the Natural Home and Body care forum.