I even switched from Dell to Sony VAIO for the Synaptics TouchPad, but now Sony has also gone ALPS
Couple years ago, Synaptics told me that HP was the only company "Exclusively Synaptics Equipped".
Dell Sales has no clue on brand of TouchPad/GlidePoint installed, you have to check latest Synaptics Drivers on the Dell Product Support Download site and click the "system this is for..." box to see which is what.
Dells latest ALPS Driver is a quantum improvement over the previous versions, but unless you have a 'stick' installed, you don't get the 'disable' page
and have to do it by cranking 'sensitivity' way down.
D800 BIOS Setup has options to turn touchpad off when external (USB or ps2) mouse is installed.
Edge Scrolling (Synaptics or ALPS) only seems to work in the horizontal mode on a very few applications, however the "Auto-Scroll" now offered on the ALPS will work any place that the Arrows (or Page up/dn) work.
The Synaptics Edge Scroll works a lot better than the ALPS, with "continuious" mode, but the Auto Scroll gives better control on setting speed exactly to your 'reading speed' and most importantly for me, ALPS Auto Scroll can be controled by my Bluetooth IntelliMouse.
I had no idea that ALL the Synaptics Features could be applied to an ALPS GlidePad/Point
but that would be excellent.
The only thing I like less than ALPS is the Windows generic ps2 touchpad driver that you get if your Driver is gone