If you bought your phone directly from Sprint, you should have 30 days instead of 2 weeks to decide. If you bought thru 3rd party dealer, then you might have 2 weeks with their sales contract.
I can see how the Treo would be a better fit to many....but I personally would have a very hard time going back to Palm OS...at least until it gets an update. Just for the fact of not being able to truly MultiTask. This has become my daily life of using my phone. i.e. have GPS going, playing MP3 music, while forwarding on an email after I opened and edited the spreadsheet in ClearVue Spreadsheet, and all the while still know that my GPS is keeping track of where my fellow DM is driving. All along having multiple BT devices...my BT headset, BT mouse, BT Keyboard (great while someone else is driving with the phone in it's windshield holder and I need to type an email), BT GPS.
As always concerns with keyboard form factor and layout is nothing more than personal preference (unless the keyboard actually falls off). I personally found the keyboard on my Mogul to be very comfortable. And this was a concern I was seriously wonder if I would have before I bought the phone. But I like the feel of it, the way it sits in my hands when extended, and the room that it offers (aka nice sized keys).
I certainly would not automatically recommend the Mogul to any user, just like I would never automatically offer any phone to everyone. I would ask what they want to do with it. If all they want is web, phone, and MP3 and nothing more I would tell them to check out the iPhone. If they have business needs, then I would recommend either the windows based Treo or the Mogul depending on their personal preference on form factor.
I myself after 4 days I am very happy with my Mogul. I wish they put in 128 mb of memory, but I do have 20+ mb of ram after all plugins and OS are loaded so it has not been an issue yet and I have tried to push it to test it. Other than that, there is little doubt I am destined to have a great relationship with my new found friend.