Channel inventory is something that every company needs to have and constantly re adjust.
http://www.forbes.com/sites/chuckjo...previous-iphones-and-ipads-channel-inventory/
Regarding ipad sales, Like TC mentioned they were towards the higher end of their expectations which were obviously better thought out than a lot of the analysts. I see the report that 2/3 of the AIR's customers are new to be a positive sign and an indication that the iPAD as a device is doing well. There is really no reason to upgrade your ipad every year or two. Even with the iPAD air. The reason may be more compelling with the iPad air 2 if apple does add capability (touch id, faster processor, increased RAM, more storage etc ) and if IOS8 runs even better on a faster 64 bit device than the old ipads. My wife only upgrade her ipad to the air because we switched carriers and got a pretty good deal..
We also have no idea of what the replacement cycle is for android tablets for any sort of a comparison. Apple needs to constantly look at the "role" the iPAD is playing in people's life in a post PHC environment...