Just like with reviews, one shouldnt go off this one person's experience with it. I agree with him when he says go play with it in a store.
Problem with that is like with HDTV's in stores and some ppl adjusting settings...ppl can open some apps on the phones in the store and not exit them right. Some phones have lil maintenance updates right after launch, like the Droid X did to fix some browsing issue and some other stuff.
And I played with WP7, the iPhone 4 and an Android phone at AT&T recently. WP7 was faster, smoother than both iPhone 4 and Android with scrolling. Do I want a WP7 phone? No, because smoother, faster screen scrolling isnt important to me. For me, its the total, overall experience.
I dont want go against what the guy is saying, but almost every review of the Atrix said its a smoother, faster experience compared to other current phones. Web browsing is alot better too. Just go and play with one in a store...