Consumer letters to the office of the CEO either receive prompt attention, or they don't, depending on the company.
If the company does treat such letters seriously, your matter will receive prompt attention, no matter the delivery method. If they don't, "restricted delivery" will be a waste of postage.
Since you can authorize the post office to deliver your "restricted delivery" letter to an authorized representative (USPS DMM 503.7.4.1.a) , you can be quite sure that the CEO most certainly has authorized somebody else to pick up the mail and read it. I don't imagine that Bill Gates personally takes time out of his schedule every day to sign a stack of little green postcards. (Return Receipts)
Some companies will simply stick a consumer complaint letter addressed to the CEO into the circular file. Others will process each one of them by the CEO's staff. Lastly, some will just re-route the letter to the customer service dept.
If you plan on using the letter as evidence in court (or small claims court), you should most certainly send the letter Certified Mail, Return Receipt Requested. However, the restricted delivery option will not get you anything additional when sending to a company.
If you do not plan on using the letter as evidence, then simply send the letter first class mail. First Class Mail to a coporate officer WILL be read by SOMEBODY, although you may not get the response you want.
Do NOT follow the of the one of the anonymous posters and mail payments to the CEO. If you mail your payment to a different place than where you were supposed to, the company is perfectly justified in sticking your check into the circular file. (Or cashing it and having the money go into a black hole.)
As a side note, sending restricted delivery to the govt. is a COMPLETE waste of money under USPS regulations, which say pretty much that it can be ignored by govt. officials.
SirWired