over a year ago, i switched from a blackberry curve to the apple iphone. the iphone has been a fairly good smartphone and i haven't had too many complaints, until a month or two ago when everything on it started to get really slow and laggy. opening an application like notes or sms would take a few seconds to show anything, then another 5 or so seconds to actually respond to a tap. by the time the camera application would actually show its video, whatever i wanted to take a picture of had usually changed or moved.
the lack of 3rd party apps quickly led me to jailbreak it so i could run things like mobileterminal with openssh and vnc. while neat at first, jailbreaking quickly became a pain in the ass, usually leaving me a version behind the current release for a while until a stable jailbreak had been released. i resisted upgrading to the 2.0 firmware for a long time partly because it hadn't been jailbroken, and the app store apps were pretty lame compared to what i already had installed.