I personally am not as it would raise my bill $10/mo with my discount on my data plan, but I know someone who is as it drops his business phone bill by $20/mo. So, yes, for some this equals good savings, but for me, I rarely reach 300 of my 450 minutes, so I'm staying on Everything Data 450 until they decide to move me over.
Speaking of which, online for new customers, they are not offering Everything Plans anymore, just the new Unlimited Plans.