I bought a GoPro 1 when they first came out. It had a few glitches. I bought a Contour HD for my second helmet cam.. It was horrible to use. Waste of money and actually quit working after about a year.
I bought my Hero 2 in 2011 I think and have the LCD backpack, Wifi backpack and remote. It still works flawlessly.
I like how the Hero 3 has Wifi built in. I wish my 2 had that, but I won't drop the money for the 3 just for built in Wifi.