This is the best teether I've found for my 6 month old. I've tried many teethers and he absolutely loves this one. It had some pretty good reviews on babiesrus.com as well.
This teether is so easy to grip and fits perfectly into my sons mouth. The teether itself is a rubbery one and he loves to rub it in between his gums. It grips their gums and teeth so it doesn't just slide back and forth. They get a good grab and they must feel that satisfaction as it rubs at the itchy gums.
I bring this one everywhere I go. I recommend you skip the other teethers and get this one. Happy teething!