It is a come-on ad, don't buy one, for one thing Singer is no longer the Singer us older folks knew & loved, that company no longer exists, the name was sold so low quality items can be sold under the "Singer" name.
That being said I have gone to 2 of those demos, many years ago (before Singer went all the way downhill) and the salesman was very skilled at techniques, I never bought one of the machines (he does throw in a lot of snake oil-LOL) but I did learn some good techniques in using a machine.
So it isn't all a waste.
Some of you might be interested in googling Singer history, esp. about the more modern histery of 10 or 15 years ago, an owner embezzled the company and that was the end.