One of the big problems from this time along with construction issues was Cuba using a lot of under-fermented tobacco. As was already mentioned, production was practically tripled from '97 to late '98 and beyond. Cuba could not meet the goal of exports and rushed cigars out before they were ready. This led to terrible cigars when they were fresh and many people stopped buying cigars from those years and still don't buy from those years. Because of that, vendors were left with an enormous amount of stock that has been aging and maturing over the last 7-9 years.
Concerning buying cigars from the 99-01 time period, it can be hit and miss. However, there are some amazing bargains to be had if you know what to look for. Small-production cigars in the lesser known marcas do not suffer near the construction problems of other marcas that are widely exported. It also helps to know the factories and which ones to avoid buying from.
I have bought many boxes from the 99-01 period recently and have been pleased with all of them. Many of them are available for the same price as new stock. There are a lot of people who won't buy cigars from this period and I can understand that. That just means more for me