Ken I agree with you about the "oh it's free therefore it must be crap" aspect of the frugality argument. I would say something to them like well, it's costs nothing to try so so it's not like you're out anything if it doesn't suit your needs or tastes. 

It's a sad state of affairs our modern world finds itself in when we all look at things we expect to pay for with a certain skepticism looking for the "catch".