Ok so I need to really think before I post (re my previous posts saying the radar was better). I didnt get enough hands on with this at CES. So I went to the store & exchanged tonight. And the unit you actually get is better then the demo units running in stores too! Besides the lack of Front facing camera I think the Lumia 710 IS better overall then the Radar now.
They are still both really similiar but the faster processor and Nokia drive app plus i like the Lumia design are enough in my opinion to make it better. I was thinking the radars camera was better (they both have slightly diff settings) Now I have to give it to the 710. But you cant go wrong really with either one if you want a good wp & your on Tmobile. But I would reccomend the 710.