Most of these products fizzled due to market competition, lack of consumer demand or just plan clunkiness. Others were cool for a time (especially if Leonard Nimoy said so), but were quickly surpassed by other groundbreaking technology.
"In the space of one hour, my entire digital life was destroyed. First my Google account was taken over, then deleted. Next my Twitter account was compromised, and used as a platform to broadcast racist and homophobic messages. And worst of all, my AppleID account was broken into, and my hackers used it to remotely erase all of the data on my iPhone, iPad, and MacBook."