We use WoodyPet and the inital set-up you are actually advised not to remove wet bedding. After that point, you do remove the wet bedding and replace with about 1/3 the amount you took out (because it expands).
I love the pelleted bedding. It makes sifting out solid waste SO easy it's ridiculous and we have not had a bit of odor issue since we started using it.
I would advise you to look at the bedding in the stalls in use and see if it is a nice color/smell or if it is a dark red and stinky stuff. If it is dark/red or stinky, they are not using the bedding properly and it has become overloaded with uria/amonia.
I agree with anyone that likes the pellets, i'v worked with many different shavings at the barn I work at but the pellets are by far the easiest to maintain, easy to shift through and the horses seem to love it too.
At my barn during the summer, we use woodypets pellets, and it is SUPER absorbent.. I have pictures of it somewhere of how much it can hold, when I find them, Ill be sure to post! We don't use it during the winter, because it will freeze solid! That's the only bad thing about it. So we just use regular shavings in the winter. Around this time of year though, we do not get the woodypets wet. It would be far too cold for the horses to lay on, as it gets near 20F at night here. We just put 2 bags in, as well as a huge wheelbarrel full of straw bedding that my trainer/BO has, and were good to go! For a week.