Samsung Galaxy S Vibrant / SGH-T959
While I've had a little better luck with this device than the SGH-T959V, I've still been left quite frustrated with this device.
* It had an OK amount of internal storage, but it is still partitioned in such a way that very little is allocated for apps.
* Abandoned by Samsung at Android version 2.
* Even though it has official builds of CyanogenMod, the GPS drivers included will sometimes completely fail to find any satellites, or simply crash (requiring you to reboot your device).