I have a small cordless dremel and love it. I got the kit with several different bits and love it, though I have not found use for all of them yet. It's come in handy for many, many applications.

I've had zero cracking when using a small drill bit and the dremel to drill holes in sterilites. Come to think of it, I haven't had any cracking when using a regular drill bit up to 1/4" either.