Hi
I have the Target one, its cheap and all you have to do is put 200ml of water down the bottom then put all your bottles and stuff in and micro for 5 minutes. I do it just to make sure the taste of the soapy water is gone.

I got the knack of using the tongs that come with it as well, so I don't touch the teats at all, the tongs get sterilized at the same time. I'm a bit fussy about these things as my DD had oral thrush as a newborn and I was afraid she would get it again, so I made sure the teats were as clean as possible.