My current favorites are the Montbell UL as you mentioned, and also the Exped UL pillow. Heres a quick comparison of the two
*The exped is heavier at 3oz
*the exped has a very nice "brushed-feeling" surface fabric—its very skin friendly and comfortable
*The exped has 2 valves–1 for inflation and 1 for deflation–probably explains the difference in weight compared to the montbell
*The exped inflates/deflates a LOT faster than the montbell
*The montbell, has two vertical support beams, cradling your head. This works great for people who sleep on their back
*the exped has two horizontal support beams, which makes neck support awesome, but doesn't cradle your head from rocking side to side as well as the montbell
*the exped is specifically built for backsleepers AND side sleepers. When viewing the pillow from the side, its kind of "ramp" shaped, so you sleep on the higher end if you like sleeping on your side (more neck support)
*I think the exped is quieter than the montbell.
I recently acquired the exped, and need to test it more, but I've had great sleep with the montbell pillow in the past