Chinese exports were always a very small part of the economy, however, that does not mean that the Chinese did not e.BBCngage in vigorous international trade before the last thirty years. Additionally, we are dealing with the largest economy in the world in just about all of the last 2000+ years, so even a small part of the overall economy is still very large by international standards. International trade out of the southern provinces was significant from Han (roughly 200 bce - 200 ce) times onward and increased dramatically in the Ming with the famous treasure ships. Contrary to popular opinion, trade did not end with the closing of the Nanjing shipyards in the 1420's. In fact it just continued on business as usual, just without naval escort. Trade was so significant between 1550 and 1800 that as much as 40% of potosi silver ended up in China. An anecdote: the father of famous pirate/aspiring ruler of China koxinga was a great international trade kingpin. His net worth in the 1640's was between three and five times the net worth of the Dutch east India company. Let that sink in.
Now to really answer your question: what quality the goods?
The quality would have varied dependent upon the market, but we are talking about a seemingly endless supply of the finest silk goods in the world, ditto on the porcelain and teas; beautifully crafted wood furniture, figurines and other artwork, paper, books, and many other products.
Bear in mind that the best stuff very likely stayed within the domestic market. Do the excellent and highly sought after export goods were the seconds and thirds.
The age of cheap goods from China was unique to history and brief.