Buyer beware.

Most, if not all, areas of business have the rogues. You must know the type: hype, deceptive descriptions, and even downright lies... anything to make the sale and get their bonus.
Citizens Band is no different and, in the days of the CB boom, trickery was rife. All sorts of deception has been used to sell products or bump up repair bills, even manufacturers have been known to get in on the act.
There are many honest dealers and engineers out there, but you should be aware of the trickery used by others, just so they can make a sale.