since you intend to use it no matter what we say, whats the point of asking if anybody had problems?

The problem with pine is the oils which are toxic. It irritates the lungs and liver of rodents and in the end makes them more susceptible to illness and shortens their life span. Rodents raised on aspen or other non pine/cedar beddings have proven to live longer and healthier lives.

I use kiln dried pine shavings but my rats are not strictly pets and I find aspen is far too over priced around here to be worth using. Carefresh is just too dusty.

If your mice are pets you want to live long and healthy lives, definitely switch to aspen when your pine is all used up.
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PHLdyPayne