I think it is worth it for the money. Im not sure how your schedule is but if your gone for most the day for school, work, whatever it is, your cham will love it. They need lots of water.
Before i bought a mister i used drippers.(homemade) It was hard for me to get one to drip all day while i was gone. I would get home and it wouldn't be dripping but still half way full of water.
Im sure some others will chime in and give you some ideas on how to make your own. I have seem some pretty good homemade ones for a lot less than the name brands.
Just depends on what you want to do...