Yeah for that price why not. I was going to try it at the Grand Californian this weekend but I spoke to an Imagineer friend who has tried it a the GC and said the concierge was not worth it there either but than he is spoiled by the Polynesian Concierge. I paid for a concierge suite at DLH and it was $650 a night and the lounge was on an upper floor of a whole different building so it was not convenient and the offerings were very minimal but for the price you are getting it will be a nice little extra.
As far as the Polynesian goes, there are many great garden view rooms there. In fact some of the garden view rooms are better than water views at other resorts. There are even a few that have partial views of the lagoon and the castle.