Love it!
I have bought probably 5-6 of these over the years - have given them to several friends and family as gifts, and several others have purchased on my recommendation.  I love that it's easily portable, so I take it everywhere with me - when I travel, to work, when I go to conferences or meeting where I'll be sitting for a long time, etc.  No matter how much pressure I use, the two pieces haven't come apart.  Simple but effective.
Rating: 5 stars