We finally got ourselves situated with the GRCS this past spring and I agree with treesmith that our cost per use is fairly steep. However, the time savings it has made on several of our jobs more than made up for it. Our first job outta the chute with it would have had to be dozens of smaller individually rigged cuts without hte GRCS. and more than half of those cuts would have needed lowering onto the other side of the neighbor's fence.
Instead, with the GRCS, we were able to part it out in 6 cuts, lifting each piece up and over the hole for easier processing.
We have since used it to quite the advantage in other scenarios albeit not as many as one would consider good for cost-for-use. Because of the saved time on the site though I beleive we have already paid for it.
To contrast its use with that of the loaders we also have a swinger. We've used that to lift stuff but that still requires an extra man, extra truck and nowhere's near the fine control afforded by the GRCS.
With multiple bases we can move the winch to several trees throughout the jobsite as necessary too. We're now looking at getting another smaller winch (easier to move around) and another full size winch to use.