Is it useful to compliment ourselves?

“Trust me, I’m really very good”
“I really do quality work.”
“My after-sales service is awesome.”
“I’m a great delivery boy.”

But are we really sure that the praises we give ourselves are of interest to customers?
In a historical period where before booking a hotel, or going to a restaurant or buying an object, everyone consults dozens of reviews … don’t you think that a new potential customer would appreciate reading what the customers you have already served think of you ?

Think about it; instead of saying how good we are, we should rather allow our customers say it.
Don’t you think that would be a great way to increase your credibility and a valuable aid to your sales?