This complex contains a number of sighseeting places. If you want to see a few at one place, this is the right choice. The entrance is rather cheap, and cost for 25000 riel = 6.25 US dollars. The only thing is that there is a dress-code for women, so if you have not covered shoulers, you’ll most probably have to buy a T-Shirt for 3$ near the ticket counter.
Overall, totally worth it.
There are palace and temples.