The newest iteration of the Sea to Summit Siliconized Nylon poncho is half the weight and size of last year's version. Both are a tad shorter.
I stand about 5'11." With my Osprey Keatrel 48 liter pack on, the poncho falls about 6-8" above my knees. On a more petite person, it will hang lower.
Also, I imagine that to save on materials, as ny-sil fabric is expensive, they may have reduced the overall dimension slightly. However, this is only a factor for someone taller and larger than me.
The S2S poncho keeps my torso, upper arms, head & rucksack dry. I just accept my forearms and lower legs getting wet. I regard this as being part of the Camino experience. As the hiking pants are 100% nylon fabric, they dry VERY fast.
On the negative side, the poncho when on DOES tend to appear to be a "whole body condom." It is translucent. One gets a few observations and chuckles with that comparison.
Also, many folks have noted that the plastic snaps do not stay closed very well in windy weather. This is true.
After experimenting first with reflective tape to hold the snaps closed, then duck tape, I finally resorted to using a dab of Super Glue on each snap. THAT seems to have done the trick. It also looks better than tape.
You just accept that the poncho is only used snapped into walks no configuration. After gluing, the snaps cannot be easily opened, if at all.
I hope this helps.