First tip, book in advance, make sure you book the corner table with the ocean view, arrive at 5:30 so you can really take in the view from this place it is stunning and one of a kind. I took my wife here as a surprise and it really took her breath away...if you know your coming to phuket and want to do it, book early, it won't be packed but the good tables will be gone if you don't.
Second trip, this place is remote....like the average taxi driver would have no clue where this is as it's up on a biiiig hill, fro karon this trip cost about 1000 bath. So be prepared, take the address and phone number so your driver can call, this is ALL THE WAY up a pretty big mountain and I mean ALL THE WAY!
Third tip, don't plan anything else that night, I had planned the fantasea show which was great but we didn't want to leave the restaurant in all honesty it was a great atmosphere.
We had the thai set menu, the quality of the food was amazing, the Tom Yum was rich, the prawns huge and red curry duck was spot on.
If you are looking for a romantic vibe THIS IS IT.....but as I said, book in advance, leave your hotel at about 430 as it takes a while to get here, and get there by 530, if you miss the sun set you'll kick yourself In the butt later, there is no better spot or view in Phuket like this. Enjoy!