I do not think trying a phone for 30 days and then returning it if you do not like it is abusing the system. I came right out to the AT&T rep and said I just bought the Inspire but I am thinking about the Atrix. His exact words were- that's why you have a 30 return policy. If you try it and want another phone, by all means, get the other phone.
All they do is re-sell returned phones as a refurb. They lose money on these phones either way and make it up your first 6 months of your monthly fee, after that it is all gravy to them. They have no problem with people doing this and fully expect it.
That being said, I am seriously considering cancelling my Atrix pre-order and sticking with the Inspire. The Inspire is just one hell of a phone that I am really enjoying. And for $79 it has blown away any other phone (and I have had a lot of them) that have cost me more than double that in the past.
The Inspire is polished, fast, feels good in your hands, has a solid feel to it, is rock solid from a software standpoint (at least so far), has very good battery life (compared to my Captivate), and I am a HTC fan to boot. I have never owned a Motorola phone, so I cannot compare, but there are so many Motoblur haters out there that it makes me wonder if I will hate too. My one big complaint about the Inspire is the speakerphone, it is possibly one of the worst speakerphones I have come across in some time. I may have a lemon, but this thing is not nearly loud enough and is very very, tinny - and dont mean that in a good way. It is basically unusable for me, and I use my speakerphone a lot for confernce calls for work. I could always use my bluetooth, but having a earpiece in my ear for an hour or more at a time gets annoying to me.
I am still going to check out the Atrix at the store if I do cancel, but unless it blows me away, the Inspire may be the phone I use for the next 12 months or so.