Hello to @ll:
Here my experience.
I bought my iPad Air 32 GB WIFI/LTE on 09 of January of 2014 in the online Apple Store in Spain. As far as I know the delivery was made from a logistic center in Italy.
Until the purchase of the iPad air I was using without any flaws an iPad 2 32 GB Wifi/3G. It's more I didn't know what an low memory error was until my decision to upgrade to the iPad air. What a decision? If I only had stayed with my iPAD2 :-(
I received my unit on 14 of January and From the beginning I had safari crashes and the corresponding low memory error in the diagnostics department of the iPad air.
I observe the performance of the iPad air about a week and after coming to the conclusion that there was something abnormal I went to my nearest apple store in order to ask the apple care tema to check my unit. They have done the usual things, reinstall from scratch and I installed the Apps one by one instead of the back up copy. But that didn't solve the safari scratches and low memory errors. I observe again the behavior of my iPad and two weeks later I decided to go again to the apple store. This time they decided to change me the unit. But as in other post here mentioned that also didn't solve the problems, currently I would say it´s even worse. A week later I visited again the apple store and report my case and again they start to install from scratch (I came to the conclusion if they don´t know how to fix something then they always reinstall from scratch).
I didn´t answer again for a replacement but they told me that that exchanging again the unit won't solve the issue and I should wait until Apple brings out an iOS update that fix the issue. They were not able to explain why on my older iPad 2 where no issues and on my new iPad air, in theory much more capable due to much more powerful hardware, I have this safari crashes and low memory reports. Furthermore I´m not sure if the guys of the genius bar are so genius because if you ask two different guys the exact same question you get a complete different answer.
Finally I decided to test the famous site ( http://9to5mac.com/2013/11/08/a-week-with-the-ipad-air-in-three-words-believe-th e-hype/?3e3ea140)on my other iOS devices, here the results:
iPhone 3GS 32 GB: immediately Safari crash and low memory error.
iPhone 4S 16 GB: immediately Safari crash and low memory error.
And now a test which knocked me down:
I tested also the mentioned web page on my Nexus 5 device and do you know what ?
Absolutely no problem !!!!!! No crash, no low memory error. I went further because I wanted to know how much storage it occupied in the RAM memory of the nexus, above 200 MB !!!!!
This is mainly the reason because the iPad air crashes and have so often low memory errors, because if it has only 1 GB of RAM and as all of us know only the system resources occupies a percentage of the RAM memory plus the background services/ upgrades and then if you also open a web page which occupies 200 MB of RAM the consequences are clearly .. . You will run into low memory.
Someone could suggest that couldn´t be Apple´s mistake if the webpage occupies 200 MB. And I would answer Yes and No,. If you have a webpage with a whole amount of pictures and you want it to reproduced in high resolution screen like the retina screen on the iPad Air does your also have to provide the sufficient memory to do so.
What a shame Apple !!! Less marketing and equipped with more RAM memory your products.
I really considering to make a change and switch to Nexus, at least the Nexus line up work fine and cost the half compared to the homologous device of Apple. Ok, the design isn't as premium as Apple but finally it works and cost less, much less.