Hey mates! New here and wanted to ask a question right off the bat

I've been looking around for my first robot vacuum cleaner and I've got it down to two possibilities:
The CleanMate QQ-3 or the Asus E-Clean. I know there are two versions for the Asus E-Clean right now but the $100 leap is a bit steep. If there are vast improvements from EC01 to EC02 then I will consider the EC02, however as of now, I'm comparing with the EC01.
First off, I wished to know which one came out first: the QQ-3 or the EC01/EC02?
Also, I read that the EC02 supposedly has a stronger vacuum compared to most other vacuums out there (5-8 times stronger is advertised). Is this true? And if it is true, is it true for the EC01 as well?
The website I've decided to purchase from is RobotShop.com and this is where I am looking at as far as my selection. They seem to have decent prices and a lifetime warranty.
CleanMate QQ-3:
http://www.robotshop.com/infinuvo-cleanmate-qq3-led-robot-vacuum.htmlAsus E-Clean EC01:
http://www.robotshop.com/asus-e-clean-ec01-robot-vacuum-red.htmlAsus E-Clean EC02:
http://www.robotshop.com/asus-agait-e-clean-ec02-robot-vacuum.htmlAny information/help would be much appreciated! Thanks so much

EDIT: Also, if you guise have any other suggestions for robot cleaners which perform comparable/better than these for around $150-200, please let me know hehe