i'm trying that style out too... what i don't like is that your whoopie is locked at a fixed length on the end of a tree strap. easy enough to do multiple wraps around a tree i suppose... but........
for my money, i still like being able to control where my whoopie attaches to the strap.
the convenience of the toggle is another item to lose, another piece of hardwear etc.... unless you search out the trail stick. a biner is too heavy.... but a descender ring might work quite nicely..........
again, i could beck my suspension for days....