I just picked this little gadget up last week with visions of never wasting a drop of paint or toothpaste again. It works like a charm, crimping out the last bit of whatever from the tube.
If you look for one of these, the heavier the construction and the wider the appliance the better. The model I got is mostly plastic and rubber and I notice that the width doesn't accommodate some of my tubes of primer.
Live and learn! I do think I'll get my $6.50 out of this gadget though!