Good grief this thread is yawn-pathetic.
My then 3 year old got a ipad, because A, it deal was fantastic (x amount, 3 years warranty, and travel Internet + case) and in my opinion much better spec wise to a hudl, which in my opinion are shit.
In the same year ds1 got a Samsung Galaxy, which was on but again the spec was poor to that of ds2 ipad.
Our iPads cost cost nearly the same as what I paid for my hudl, only it didn't come with all the add on's, I don't like android, I find them poor quality, flimsy and cheap looking and the spec poor also.
This year my 5 year old got a hp laptop which suits his advanced IT needs, (he's currently doing Y5 IT work)
DS's school has a ipad for all kids, they learn via iPads and Apple Macs, so it's also technology they use to learn in school also.
Some 3/4/5 year olds do know how to read, ds2 has the reading ability of a 9/10 year old (according to his school)
Ds1 (8) got a iPad this year because we wanted him yo upgrade his samsung Galaxy which went to his 3 year old cousin with SN.
Ds2 when in hospital had a iPad which saved us from months and months of boredom, he loved IT from that moment, and loved learning and doing new things all computer related.
Each person is different, each have different wants and needs.
All opinions are just that and no one should take them personally, after all it's just random people giving their opinion behind a screen.