I am glad that the ROCKWOOL certificate is available at all, the customer looks differently at the contractor who has such a certificate. My company is more reliable and proven to him. I have been awarded the Supercontractor certificate for 6 years, my father ran the company before and he also tried to regularly extend its validity. The trainings necessary to obtain it are useful, but I have noticed some repetition when riding for many years. However, I recommend every new performer to participate in them.