I have and would highly recommend the Seidio Active as well, but it's by no means a "slim" case, which is what this thread was asking for.
Seidio does, however, make the Surface, which is slim:
http://www.seidioonline.com/product-p/csr3ssfas-bk.htm
Seidio does, however, make the Surface, which is slim:
http://www.seidioonline.com/product-p/csr3ssfas-bk.htm