I love my needle threader. The only time it gives me problem is if I'm using thick thread like Buttonhole twist. Then sometimes it doesn't want to pull the double thickness through the eye without a bit of help.
If you still have problems, try this needle threader. It works from the front so you don't have to try to feed it in from the back of the needle.
http://www.thegadgetgirls.com/gadget...-threader.html