Companies are graded from A to F based on number of complaints and responses to these complaints. This information combined with the # of employees determines a company's grade. Keep in mind, the BBB information may not reflect the whole story - there are always two sides to any situations; however it does show a trend. If a company has numerous complaints, then most likely they have product or service issues. Patterns of behavior are important.
If someone has consistently neglected to adequately take care of the public in the past, there is a good chance they will do it in the future. Pre-engineered nhà thép tiền chế steel buildings are a large ticket item. An investment of this magnitude deserves a great deal of verifications. A salesman is inclined by nature to present the most positive position and rarely if ever brings up issues that don't enhance the sale.