We dig our GRCS. We've had a vehicle down for a few days, waiting for an exhaust brake, so we've been in minimal gear mode. We've used the port-a-wrap for some big removals, and I've gotta say, the GRCS Aluminum Bollard allows for dramatically improved control over lowering, no doubt due to the larger bend radius.
The reluctance to set it up could be attributed to the weight of the frame, but time shouldn't really be a factor. Two guys can set up the frame in only slightly more time required to secure a sling. A choker sling with an endless-loop hitch makes for super easy solo setup...just estimate the desired height of the frame and set the hitch, then hang the frame on the hitch by the fairlead. Easy-peasy. If the sling and hitch are rated for enough loading, you can hang your fairlead redirect block (XRR, whatever) right there. Bam.
Although the winch is great for sweating lines during negative blocking scenarios, it's not always required. It depends on the tree. The "positive" feel you get from operating a fixed bollard vs. a floating P-a-W is really noticeable.
Setting up a redirect over the fairleads is a must, since shock loads and high pulling forces could make the system rotate around a stem if it was pulled horizontally.