I will speak in favor of the Hobbs. I bought one maybe 6 years ago and can't imagine rigging without it. I love it and it is built super tough!
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Frans wrote: The GRCS is a device that ONE person can use to almost effortlessly lift limbs, lock off a load instantly and walk away from the device to do something else, come back and resume lowering.
No other device on the American market can even come close to that.
The Hobbs (of which there is only one type available, the new one) is primarily a lowering device.
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I disagree. You lock off a load on the hobbs as well and can walk away. One groundman can use it with no problem. We lift stuff with it all the time, generally it would be a long limb over a house; I would tip tie the line to the limb and it runs up to a snatch block. Groundman puts 4 wraps on the drum and inserts the big crank handle, (here's where the GRCS might be better one man wise?), then the groundman cranks the handle while another pulls on the rope. (a tallented groundie can do this alone, but it's better with two, that way the cranker can also move out of the "dead zone" and not have to be tending the rope right away). Anyway, I notch limbs on the upper side and raise them to verticle with the hobbs all the time.
I can tell you it's tough. When I first got it many years ago, I made some mistakes. Like installing it on the trunk first thing even when I had some big lower limbs I could freely drop. I wacked the Hobbs a few good times with some extremely heavy oak limbs and it didn't hurt it a bit. It made me cringe though. I wasn't used to having something on the trunk that I had to look out for. I don't think I've hit it after that fist year, well... maybe once or twice more.
I have not used a GRCS, and I'm sure it's great too. I think you need to hear from someone that has used a Hobbs for a few years and has then used a GRCS a few years to really compare. You need some time with a piece of equipemnt to learn how to use it to it's highest level.
I've used the hobbs deep in the woods to pull over trees when I didn't have a rope winch or come-along. Put the hobbs on a tree, put a snatch block 2 feet above it and crank away.
The hobbs is heavy. Is the GRCS?
Someone mentioned they broke the crank handle already. How many others have broke stuff on their GRCS or Hobbs?
Just thought I needed to speak up for what I think is a wonderful tool.