Very nice. I almost died at Beng Mealea. Climbing on top of the temple can be a little hazardous. And if you do it wearing sandals it is REALLY hazardous. I just about slipped and fell off the top. Luckily my guide caught me just in time.
When I went we combined it with a trip up Phnom Kulen which I wholeheartedly recommend. There's a nice waterfall , some interesting carvings on the riverbed. And you can get a picnic lunch cooked on site. We had a roasted chicken that is served with these little cups of salt and pepper and local limes. You squeeze the limes in to the salt and pepper and dip the chicken in it. It was very good. Mostly it was locals out for a day at the waterfall.