Fact: the message "not charging" when the iPad is in fact charging is incorrect and can therefor cause someone to take unnecessary action. I have an always on powered hub and still get the message even though the iPad is charging just fine. I haven't timed it, but subjectively I see no difference using the PC, the powered USB hub or the Apple-supplied wall wart [yes, that is the correct spelling}.
Someone early in this thread said "If you don't like Apple products, don't buy them." That statement comes with two problems: 1) some Apple products have desirable features, not least of which is the screen on my iPad 3, so not buying isn't much of a solution but 2) Apple users and marketers would have you believe that Apple is fully intuitive, has no hidden quirks, and is better than cold beer and pretzels.
I have used many different computers, operating systems, and applications over a working lifetime in the computer industry. Apple products, the iPad in particular, has if anything less intuitive, more gimmicky interfaces than average. To those of you who worship all that is Apple: you are worshipping a marketing-hype idol. Be more iconoclastic. Apple has good points and bad, just as Windows, Linux, the PC platform, Android, etc. Be honest about it, not self-righteous.
BTW, I installed the Asus AI package on my desktop and have seen no change in the "not charging" message. Charging continues as before - not sure yet if it's any faster.