The size of the 5800 was just perfect, and it was feature packed. I loved the flash, the video editing and the front camera. The Captivate lacks all that! (Also GPS worked great on 5800).
But the deciding factor for me was the software. Symbian is way, way behind Android.
Are you kidding me, The reason i'm leaving Nokis is because of their dated hardware, in my opinion good speakers on a phone should not sell the phone, as a protable MP3 players i use head phone 99% of the time.
I have Nokia N81, N82, N85, XM5800 and then the X6 for the last 4-5 years and can vow from experience that the reason their OS lagged behind because of their limited HW.
Don't get me wrong, there were only a couple of thing i enjoyed during my Nokia experience. First was when i hacked it and install GarminXT. Ovi map blow, at least i can vow for the US side, it's very inaccurate in Florida.
Secondly, the N82 camera with xenon flash took the some of the best pictures. Other than that, most their latest phones are primitive compare to the Android or Iphone. To me Nokia is all about hype than putting the best phone out.
Personally, I think XM500 is too thick and the resistive touch screen and the camera are junks. I had it on At&t 3G for a year and upgraded to X6 because of that.
What open my eye was when i played an Android Mile Stone, you tube open in seconds and touch screen blew my X6 away. It make my phone fell like an (old)brick.
In conclusion, to loyal consumer like me, I felt that Nokia cut corner to save money and try to sell their brand name not the quality product. OS is way far behind due to the weak processor and supported RAM in the phone. They cover it up by adding bell(Carl Zeiss optics) and whistles( OVI map) but in the end, weak OS/HW are magnify and failed to deliver a good experience compare to their competitors.