Yesterday I finally brewed up a couple of free samples included in a recent order from Norbu, two loose young sheng puerhs: 2007 Spring Yong De Mao Cha and 2010 Spring Lao Ban Pen Mao Cha.
Both of these have long intact-appearing leaves and a fair bit of stem. The leaves smell sweet and earthy, a stronger mushroom odor to the Lao Ban Pen than the 2007 Yong De.

Yong De on left, Lao Ban Pen on right
I put 2 grams of each into my tiniest gaiwans, with 1.5 ounces near boiling water. After a flash rinse, both smell even stronger and more delicious.
First infusion, 205°F/96°C, 10":
YD--sweet anise
LBP--smoky, earthy, sweet
Second infusion, 205°F/96°C, 15":
YD--sweet anise, woody/earthy starting up
LBP--sweet and earthy, woody, bit of anise and smokiness lighter already

Yong De on left, Lao Ban Pen on right
Third infusion, 205°F/96°C, 20":
YD--sweet anise, woody/earthy
LBP--sweet and earthy, woody, bit of anise, smokiness almost gone
Fourth infusion, 205°F/96°C, 20":
YD--sweet anise, woody/earthy, still the anise is very strong, bit of bitter aftertaste
LBP--earthy, sweet, smoky
Fifth infusion, 205°F/96°C, 35":
YD--sweet anise, earthy has retreated now, bitter/sweet aftertaste
LBP--sweet and earthy, bit of herbaceous flavor
Sixth infusion, 205°F/96°C, 60" (stopped to take a picture of the leaves):
YD--sweet anise and earthy, rich and strong
LBP--sweet and earthy, deep, warm, rich
Seventh infusion, 205°F/96°C, 1': both a little dilute, should have let them go longer, more sweet water with hints of anise (YD) or earthy (LBP)
Eighth infusion, 205°F/96°C, 3': oh, this is much better, my anise and earthy flavors are back. Still delicious, yum. Young sheng stars.
Losing count--10? 11? still wonderful, both of them. Troubling fact: I want to shoot the spent leaves, lay them out to show the size and pluck, but they're just not quitting, now 15, 16 infusions in. It will be a long night.
1.5 liter later (the kettle was filled completely when I started), they're not as rich, but still, a little better than just sweet water.
Wet leaves are are mix of light brown and green, but the LBP is more uniformly light green, and the leaves are a bit smaller than the YD.

Yong De on left, Lao Ban Pen on right