Reminds me of my favorite smartphone ever, the HTC Touch Pro2. Thanks to a hack from xda devs I managed to dual boot Android on it through Gingerbread, but after that, there were no tilting sliders for Android. HTC abandoned keyboards. Samsung mostly made crappy ones Motorola itself made droids/milestones, but they never tilted. There bulky bluetooth cases, mostly for iPhones or Galaxies, but the quality was horrific.
This is being made by an old school Nokia user who really wanted a quality tilting slider again. Vive le QWERTY!
I also used the keyboard to read. I held it in portrait with the keyboard out and tilted, like a book. I had my thumb over the arrow keys, and used them to turn pages. Most comfortable ereading experience I ever had.
And of course, it was the best mobile keyboard ever made. It was a joy to type on. The only good thing about on screen keyboards is using them caused prioritizing of text prediction. Swiftkey is particularly good at that. Of course, you can use text prediction with a physical keyboard too.