I've been using the No-Drill Ram Mount, like this one over the last year or so -
I like it ok. Works fine on paved roads, shakes too much (for my tastes) on a dirt road, especially with washboards. Even with the screen support, I still prefer to leave the screen down until I'm at a stopping point.
The Tough Tray is a SOB, IMO, to place the laptop onto and remove the laptop from. The clamps also make it a PITA to access the disk drive.
But I do like the additional equipment that's available with it, like the screen support and the quick disconnect. The base that bolts to the seat brackets stays in the truck permanently. The telescoping pole and tray only come along when needed.
No complaints regarding leg room from my primary adult and child passengers. YMMV....