Last year I went through a series of test saddles from an LBS, and one of them had a surface that prevented movement. I thought it was awful; I couldn't easily make small adjustments that normally happen without thought. Moving hand position, climbing or descending, or just changing level of effort might lead to a slight shift in position. Not to mention just wanting to move a bit for comfort.
I tend to think if you need a sticky saddle to stay in place, your bike fit is probably off. Bike fit has enough variables it's indistinguishable from magic, IMHO.