Glacier Breeze ice chamber vs just water – anyone notice a difference?

Tom, I'd say the ice chamber is worth trying on hot, dry days but not something to expect miracles from. With just water you still get the fan plus a bit of evaporative cooling, and the ice mainly helps for the first stretch before it melts. If your room is already humid, ice won't add much and you may just feel damp air, so I'd save it for dry heat and small spaces close to you.