I'm the odd man out here. I mostly hate them.
Let me clarify that, though.
If the picture shows something the product pictures do not, it is useful.
If it's just a picture of the toy sitting there, showing nothing in particular, it's not useful.
Make your pictures show a thousand words. Show flexibility, size comparisons, special things about packaging, texture, charging ports or battery compartments, controls, etc.
Don't just set your vibrator on the table and snap a pic. That does no real good.
And, for the love of all that is holy in dildoville, size your images so they don't take up the whole product page. I find this especially distracting in the extended template. Everything is so spread out already, then you add images and it's almost impossible to find info without scrolling half your day away...
Just my opinions, of course.