After looking at initial review, I would have to do a good cost comparison.
It appears that Concierge cabin may have too small a closet and bathroom; thus need for Penthouse Suite. With $16.50 per person per day gratuities, high internet fees, and alcohol cost (I like to drink on vacation), Marina could end up more expensive than Regent.
Still, if the right itinerary came along and the right set of cruise mates, it would be worth a try.