Seemingly we're the only people who had a horrendous concierge experience.
We stayed in a Category 1 on the Wonder in January 2002. The cruise was fine, but everything that could go wrong with the concierge did...
We never received any advance communication from them...in fact, this is the first time that I learned that perhaps we should have.
We were one of the firsts on the ship and could have easily booked our own reservations. Initially, we waited for the concierge to come around (our mistake, given our experience on other cruise lines) to take our requests. No big deal...once we figured out that we needed to go to them, we headed over to them, waited our 15 minutes, and put in our Palo and Spa requests, still plenty early in the afternoon.
Well, needless to say both reservations were booked incorrectly...Palo was for the wrong evening, the Spa for the wrong service...and yes, we had filled out the forms correctly.
Turned out that Palo was already filled up for the evening we requested. "Really?" I said..."I thought we had boarded so early." Turns out it didn't matter...the concierges collect everybody's requests and THEN go make the reservations later in the afternoon. By then many times are already filled.
As for the other "goodies", I think the three chocolate chip cookies (same ones available poolside) dropped off one afternoon for six people pretty much epitomized our experience.
We were never loud, obnoxious, whiney, arrogant, or in any way unpleasant to them. They maintained a professional facade but really could not have been less friendly to us. Somewhat surprising, really.
Piece of advice #1 - if you need a specific time and day, better to make the reservation yourself. I really didn't find the concierge service to be a real time saver...I suppose if you need to make reservations in many places it could be. But you also will have more control booking yourself.
Piece of advice #2 - Not sure if you have had concierge/butler experience on other cruiselines that may affect your expectations as was the case with us, but if so, keep your expectations low. Think of them as a central booking service.
Piece of advice #3 - Book the category 3 for the extra space instead of the services. The extra room is the real benefit. The concierge is just a throw in.
Others will be along shortly to defend the conciereges, and if they've had first hand experience, then they should.
But in our experience, however, they were a complete waste of time.