I have one. Don't use it that often, but when I do, it's great.
One of the main advantage I find with this tool, is that while the branch is falling and there is slack in the rope, you can quickly remove all slack with a quick pull. That wound be impossible with a port-a-wrap.
Attach a drill, or better yet, a Milwalkee superhawg and you can quickly pull until there is no tomorrow. I'll sometimes use this to ascend a tree (no wraptor yet
)
I wanted to buy one years ago, but couldn't justify the price. So I waited, and searched...... And waited and eventually found one on ebay (new) that I jumped on. Drove 4 hours each way to get it, but the price was right.
When yours does arrive, use it on several simple jobs first before tackling the harder stuff. Get to know its limitations.
And No, it won't replace a crane....
However, sometimes you don't have access for a crane. As long as you have a high (and strong) enough place to set your block, the CGRS will get it done....
You'll just end up taking smaller pieces.
Chances are you're gonna get "hosed" on that job if you bid it before you've tried a GRCS (I hope not). You'll just have to chalk that up to experience.
Best of luck.