I almost never buy the same tea twice, aside from one or two exceptions, staples. Even with the best tea, I simply file away its awesomeness for later and move on. This is particularly true with oolong.
But I can't stop drinking the Signature Roasted TGY from Just4Tea. After finishing the initial sample June sent me last December, I've purchased it twice, and soon I will place my third order. This TGY hits the spot for me and has become my favorite oolong; I drink it more days than not.
It's high roasted but not over powering. Similar to yancha, lots of chocolate, but with fruity nuances that bring a subtle complexity. Very smooth, not sour, and only astringent if poorly prepared.
Sometimes I'll brew it using a larger kyusu, which will yield a few delightful but simple infusions, good for meals and casual drinking. Other times I'll gong fu it with a much smaller yixing. I can get a half dozen or more infusions. These tend to be sweeter with more fruit.