Jitterbug cell phones for elderly parents

I haven't been posting as much as usual because I've been taking care of my mother who just had major surgery to remove cancer from her colon.     

Like many older people, she doesn't have a computer or internet access.  Yet as she recovers, she realizes that she'll need a cell phone if she plans to drive again, just in case of an emergency.

Jitterbug is what she's looking at.  They have made cell phones easy-to-use for  the technologically-challenged.  With big buttons, bright screens and no unnecessary features, it looks great for the elderly who want something just for an emergency.  Best of all, there's an operator always standing by to help out.

Has anyone had experience with them?