Typically yes, but just like anything there is always some risk. Understanding the risks may help. Some passport expediters are large companies with a workforce in the hundreds, some are small 1-2 person businesses. Typically the smaller the business, the more attention that is given to oversight of employees and complying with all regulations, penalties exist for expediting companies that don't follow proper Department of State procedure. Larger companies have more employees and while every company has to follow the same procedures and rules, there are more hands touching your application and paperwork with larger companies.