Hi -
I have one good friend who is 4 years into her 5 year CareOne plan. She has had nothing but positive things to say about it. It has forced her to rely on cash only and she has completely changed the way she thinks about and spends her money.
She has done so well on the plan, that her sister is now 1 year into HER 5 year plan.
I do know that both of them pay their American Express bills directly to Amex as they (Amex) don't participate with CareOne.
I hope that helps.
Good luck,
Laura