Has anyone used Stevia leaves?

Hello everyone! I'm just looking to find some information on Stevia leaves and wondering if anyone has used them. I purchased a small bag for $1.00 at a local farmer's market, and want to try using it, but I'm not sure about using it. I never use regular sugar in my coffee, cereal, or anything I want to sweeten myself. I usually use Splenda, but people keep telling me it's really bad for you used over a long period of time. Not sure how true that is, since everything seems to be bad for you these days, or so the critics say. Ha!
Any information would be great. I'd like to pass this on to my mom who is diabetic and uses Splenda on a regular basis, as well.