I extended my stay at Earthwalkers by an extra day in order to see this, their favourite temple. It was recently cleared of landmines and was left as it was found which is to say overgrown with jungle. It is a nice temple to visit and there was no one else there when I went. It is outside the main park so you can't use your pass and have to pay a separate admission of something like three dollars.
The main reason not to go to this temple is the journey. I was told it was an hour and a half. It took over two hours on really washed out dirt roads on the back of a moto to get here. We also got a flat tire so had to push our moto for a while. I believe this was the day my driver had to borrow money from me too. Although I hired him for three out of the four days I visited temples he didn't get paid until I settled with the Norwegians. He needed the money for gas and like I said I got on well with my driver. I found the Khmers much nicer than the Thais.