According to the Cork Quality Council, CQC, colmated corks have the life span of all natural high grade corks, but are substantially cheaper. So you could use them for a complex Cab you intend to age for 20 years or more - which I did. According to the CQC, agglomerated should only last 1 year, and tech 1+1 up to 3 years. According to Wine Folly, the simplest reds, and whites like Chardonnay and Viognier, need 2.5 years MINIMUM aging. So factoring in realistic aging times and overall costs, these easily become the go to corks.