Club orange can upgrade you to the aft or spa variety. Spa rooms don't come with any additional benefits, it's just literally closer to the spa.
In my opinion, club orange is worth it. They figured out a proper price point, so it's not necessarily a "steal" and I don't think it's "overpriced".
My advice is use club orange, and request a room that's near the amenities that you use. If you are a smoker, go aft. That way you are closer to the smoking section.
If you enjoy the spa and feel that the thermal suite is a must have, go with something near the front. Preferably the "spa" named rooms.