The Samsung Dart performs as it's supposed to, though there is noticeable lag when using the smartphone. The Dart comes with a 600 MHz processor, very much like the LG Optimus T that's also an entry level smartphone from T-Mobile, and runs Android 2.2. The Dart, like the Optimus T, isn't exactly smooth when it comes to running Android and beyond the lag, the more processor intensive applications don't run. If they do manage to start up, they typically crash soon thereafter.
The call quality was decent for both incoming and outgoing calls. It was actually better than the Samsung Gravity Smart, as it didn't have any echo or distortion. The volume level could have been increased for incoming calls, however, as it was a bit hard to hear the other side of the conversation at times. Overall, however, the quality of the phone calls was surprisingly decent.
The 1200 mAh battery is a step smaller than the 1500 mAh found on the more recent entry level smartphones, and the small step down is very visible. The phone was able to last a little over a day with normal use, including browsing and GPS, before it died out. On standby, it lasted a good four days before signing off.