old people

[shortbus182]

My parents are currently with verizon paying $70 a month for 2 lines. I told them I could add them to my plan with Sprint for $40 month. They are interested. Next question is which phone.
I am personally leaning towards the Hero for them, because of the larger screen, navigation, 5mp camera, and possibly tethering for their laptop.
My parents are mid 60 and not too tech savy. My dad likes his simple flip phone with the big buttons lol. They to my knowledge, have never texted, nor do they surf the web on their phones.
My question is would the form factor of the hero be too much for them? I personally think the on-screen dialer is large and simple, but anyone who has had experience giving an older generation one of these phones please chime in.