Yip we've one. I love it but the bugger goes through oil like blazes, I've never costed it per week but I would think it is expensive to run. With the cost of oil being what it is I wouldn't put one in now.
Saying that we don't get the full benefit being out at work all day.
The only thing I would say is we probably dont put our heating on as much when e are home because it keeps the house from ever getting very cold.
I never use my tumble drier, I just put a clothes horse in front of aga before leaving for work.
Bottom oven doubles as a slow cooker, stick stews, casseroles etc into bottom. Come home at night to dinner ready.
Also we tend to be home late so it's great not having to wait on the oven heating up.
Oh and you never have to clean the ovens as the high constant heat burns everything off!!
I do love my aga, I just feel very wasteful that it's burning oil all day when we are out.
Hope that helps. X