Went there few years ago and decided to go again during last trip (few days ago), the design changes each year so I don't think you will get bored for revisiting. Entrance fee is more expensive for tourist - 300 baht if you compare to their locals but still acceptable, they will provide you a winter jacket before entering the dome. Long pant, gloves and shoes (not slipper) is recommended if you plan to stay longer for more photo shoots.
Inside the dome there are 4 sessions, each session has different theme and statues, they all very beautiful and look nice with light but advised not to touch to avoid electric shot. If you are wearing shorts and slipper, you would start to feel cold and stiff on your finger after first session, try to keep yourself warm, breath normally and slowly. Try to take as many photos as possible and not to stay in the same area too long, you can come back to the entrance area or any area you like to continue photo shooting as long as you didn't walk through the exit. Otherwise I believe you will end up to enjoy at the first/second area and keep rushing for third/forth just to roughly see and get out of the freezing zone.
I enjoyed very much and definitely will visit again in the future.