I've got a coverup. It's not bad. The cover sits very securely. Not top quality but it's ok. The outside is leather. A more expensive (but prob better quality) option are the cases from tuffluv:
http://tuff-luv.com/e-readers/sony-r...950-cases.html
Alternatively there are some cases from m-edge that are made for the Kindle2 but fit the 950 quite well.. there are threads in this forum with pics/opinions from people that use these.