What people above have said makes sense… trouble is, I HAVE bought the product, well before trying to review it, AND was logged in on the account used to buy it.
And I have written many complimentary things about their products over the years…
http://sheepdogguides.com/ec/SF09351-LCD.htm
… for instance. One less chore to spend time on, I guess!
It does raise the question, though, of where the “reviews” we DO see come from…
Oh well.