Love mine! Mine doesn't look like the ones in the photos you have. Ours is just a clear like ball that holds the liquid.
My most favorite scent is Gingerbread. I got turned on to it at Christmas a few years ago, and I just love the way it makes the house smell all year.
Some of the scents/flavors give me a wicked headache, and I can't keep the thing lit for too long. I think Ocean comes to mind, but I don't remember the manufacturer.
Gingerbread is great, tho. Makes the whole house just smell very warm and cozy. It's also not too intrusive. When I have it going and someone walks into my house, I'm often asked what I'm cooking.