It's worth a ride up to if you have time on your hands, want to pick up some Burmese cigarettes or just to enjoy what is a quite pretty ride.
If you do decide to venture out here, swing by Khao Hin Tern Park which lies between Darn Singkorn and Prachuap Khiri Khan, where you can see some unusual rock formations -- the border is more interesting, but if you're in the area you may as well take a look.
There is no word on this border crossing being opened for foreigners. If you're booking a visa run from Prachuap Khiri Khan, you'll be going to Ranong -- not to here.
The Travelfish newsletter is sent out every Monday and is jammed full of free advice for travel in Southeast Asia. You can see past issues here.