I love the Aspen cases and have several. There is always an adjustment period where they feel really slippery at first, but then they get a nice feel on 'em.
Same here. After a few weeks they have a great feel.
I love everything about the Aspen EXCEPT the buttons. They have a sharp bezel that does not feel good at all. Almost all the super cheap cases that use metal buttons have better buttons than Andar.