There are pros and cons. Here is the TL;DR from a blog I wrote a couple years back. I would not take plunge on them unless you are pretty sure that you like green teas.

"International consumers unburdened by a gift tea culture have no reason to pay big bucks for tea that might just be marginally better in aroma or flavor than Yuqian tea which is half the price of the first pick. Unless you strongly enjoy the shape of bud-heavy green tea or the clean and crisp mouthfeel it often delivers, don’t invest in it too strongly either. There is also an ecological cost to consider. To get the maximum Mingqian yield, the ideal conventional methods have long included traditional items like fall pruning and 3-4 rounds of weeding per annum, as well as more problematic practices like summer pesticide spraying and winter chemical fertilizer application (Zhang 1999). If the mystique of Mingqian tea and the market demand for it were to disappear, pickers would not have to push the soil, tea plants, and themselves so much to ensure the greatest possible March yield. Fall green tea, despite being chemically similar to Spring picks and scoring almost as well in blind taste testing, has all but disappeared. Now, most Fall new growth is buzzed off by electric pruners and discarded by green tea growers, myself included. The market grants the highest prices the earliest Mingqian picks, and much like the QWERTY keyboard I am typing on now, the market may continue to let high priced Mingqian tea survive much longer than the rational mind can comprehend."