Nick-
Mind if I borrow a lightbulb?
1. How often is the sawdust changed? Does the moisture from paint lead to rot or mildew? Or is the sawdust changed over too often? Or am I imagining it to be worse than it is?
2. Doesn't the sawdust depth vary over the course of a day's play due to uneven traffic?
3. How fine is the sawdust, and isn't it a problem cleaning out of markers?
4. How difficult is changing direction at high speed? That is the biggest problem I have seen in sawdust covered playing surfaces.