The DC-9 Classic gets a great review at the Voo Virtual brazilian simulator forum.

Marcelo Fontenele writes:

This was my first Coolsky product, however, if the other aircraft that are available for sale have the same quality as the DC-9, I intend to buy them later with complete certainty.

Original text:

Esse foi meu primeiro produto Coolsky, porém, caso os outros aviões que estão disponíveis a venda tenham a mesma qualidade do DC-9, pretendo adquirí-los posteriormente, com total certeza

Read the full review at Voo Virtual