<my .02>
To follow up, WDWKook pretty much hit all the major points. For us it's a combination of convenience and feeling a little extra special.
The lone downside...there is no difference in the rooms. Actually there is one difference that some (many) feel is a negative in that all the balconies have enclosed walls, not slatted. If you are sitting down or have young children you and they will not be able to see anything except a wall of concrete. You have to stand or have younger kids stand on something or be held to enjoy the view. Outside of being on the top floor with no one above you, there is no advantage to the room itself on CL.
You will probably not make up the entire difference in cost, but I'd say it would be hard NOT to easily save half the $110 extra a night in food alone. This all depends how often and when you are at the resort vs. being in the parks. You are going to have a free breakfast, and deserts and drinks at the end of the day at a minimum. If you come back for a break during the day, you'll have snacks/cookies/treats. If you are there around dinner time, you could pretty much eat dinner and be filled by their offerings if you chose to do so. So just in food cost alone you will save some money, but the ability to grab a quick breakfast and eat there or grab stuff and eat back in your room without dealing with Roaring Forks, is a huge plus to us. Getting to the parks early is the #1 tip for anyone going to WDW and the CL helps in that regard.
The IPO can do all kinds of things for you (and I know because I've had them do some crazy requests) so that is a big benefit. If you don't want to deal with ADRs, they can handle it all for you. If not, you aren't really missing anything.
The more personalized check-in does make you feel a little more special and it's great to get everything done quickly especially if you have little ones waiting in the checkout line with you. Being taken straight up to the 7th floor makes you feel a little like a VIP.
Having your own concierge right there on the floor to help with anything is a huge plus as well. They can do all kinds of things for you. For example, I usually plan out every day so I know how many days worth of tickets we need (which pretty much everyone has to do to figure out their ADRs). However I usually leave a day or so "empty". I usually short the number of days when I buy my tickets by a day or two in case our plans change. Up to the last day of the ticket, I can then have the concierge there just add a day or two as necessary and charge me the difference. I'm sure you could do it at the parks, but it's easy for me to do it there while the wife and kids are eating desert.
So in short, will you break even in cost - probably not. Is it worth it? Depends...if you can afford it, then I say it's worth doing at least once to try it and see. If you can't afford it, the WL is so special anyway that I wouldn't feel it's a big deal if you don't do it.
Enjoy!
</my .02>