Same here, Pelorus. I used my Simpson capstan winch to suspend an appx 90 foot bitter cherry, and once to swing a twin stemmed alder up and off a house. However, I had modified my Simpson for bi-directional use, that is, for lifting first, then lowering. It isn't designed for such an application. As well, the capstan is too small, and is prone to hockling the wraps.
As I've had both a GRCS and Hobbs since 2004, I've not needed the Simpson for such use for years.
And, several times, I've rigged down huge storm trees as Nick has shown, up to 36" dbh and 160 feet tall! Clearly well above the capacity of the GRCS or Hobbs, at least for lifting. So you have to make repeated salami cuts low to the ground, until weights are within a range of manageability.