That's a cool tool. I've never seen that before.
Unfortunately, most tree services have bull ropes, and don't use wire rope. Furthermore, the GRCS has the ability to feed out rope under extreme load with good control. It has a dead-load lift capacity of 3,000lbs, which beats your Griphoist by a bit.
Wire ropes have less shock loading capacity than a synthetic rope, too. Sometimes that stretch is important to have, other times, not so good at all.
Unfortunately, most tree services have bull ropes, and don't use wire rope. Furthermore, the GRCS has the ability to feed out rope under extreme load with good control. It has a dead-load lift capacity of 3,000lbs, which beats your Griphoist by a bit.
Wire ropes have less shock loading capacity than a synthetic rope, too. Sometimes that stretch is important to have, other times, not so good at all.