I love it!
There's one problem, however. Unlike my prior case, the Nutshell Treo 600 is so comfortable (I wear it horizontal) that I usually forget I'm wearing my Treo 600! Thus, I often forget to take it out and charge it! Before, when it was uncomfortable to sit with my old case, it was easy to remember to charge it :)
Updated: 2005-10-10. My brother-in-law's Nutshell Treo 600 case (purchased in late 2002) developed a small tear. Tuff-As-Nuts went far beyond what the warranty would have suggested was necessary ... truly splendid customer support.