The TM2 is an awesome tablet given the price, but HP doesn't even offer an outdoor viewable option. Without that option, you're pretty much lost in the sun (the same is true of non-tablet standard notebooks).
That's something you see more on business notebooks like the ThinkPad, some HP EliteBooks and etc. The TM2 washes out a lot in the sun and the high gloss display glares-- it's really not a good choice for outdoor use. Since standard notebooks/tablets aren't terribly viewable in the sun, we only video the ones that actually are meant for use outdoors. That $325 outdoor viewable option on the ThinkPad makes a huge difference!