I bought my wife the Upstage last week after she left her LG out in the rain over night. Yes I think it was done on prupose =p
I like the phone alot. It has many great features such as the offline music player, bluetooth, and the touch pad on it is a nice innovative design by samsung. Granted until you set the sensitivity where you want it, and learn that a quick brush is better than a solid contact, it's frustrating.The camera is 1.3 megapixel, but takes surprisingly nice photos. For a phone anyway.
The only issues I've found thus far is with the bluetooth. I have 3 headsets and it will not connect to any of them (motorola hs815, hs820, and a southwing). It will connect to my Motolora L2, and to just about any phone out there with bluetooth. On the Sprint website it mentions that only contact sharing is capable but i've transfered ringers, photos. contacts, and music to, and from it.
All in all its a great little phone, and I would highly recommend it to users who are proficient.