We're completely fine with an iPad at our house. The 2yo DGS has it figured out, the 3yo DGS has it figured out, and if DH and I can't do something on it, 10yo DD will take it away from us and do whatever we need. (Sheesh, kids these days! )
I don't see the "need" for kids tablet. I know they can have some specialized apps for them, and some have special covers to make them more kid-friendly... But you can slap a heavy-duty cover on an iPad, there's tons of free and low-cost apps, and the whole family can use the iPad. And your child won't outgrow it in a year, when they are using regular tablets in school (at least, our local schools use iDevices).
--Mimi
Mom to Lala (2004), Bonus Mom to Big Sis 1 (1991) and Big Sis 2 (1992)
Grammy to Big Kindy Kid (2011), Big Pre-K Kid (2012),
Grandbaby Appendage (2014), and New Baby Grandboy (summer 2017)