I loved my old rigSAVER, made from the 3 strand. I pushed it way beyond its limits though and was starting to worry that I was going to break the body of it. Now that I have rebuilt it with heavier material I am psyched.
I have never needed to set it 'choked' and retrieve from the ground but I have set it in basket and retrieved it plenty of times, always with a simple overhand or figure 8 knot jamming the pulley. I was able to pull an overhand knot through the RIG once, in a test on the ground, which is why I added the XRR on the dead end. I figure hanging it in basket with the XRR tailing it will never slip the retrieval knot through both the RIG and the XRR. I also thought I could use all 3 pieces to equalize smaller rigging points above a 'big' crotch.
I will use basket configuration for most everything except blocking down wood, or rigging off the occasional piece where there isnt a crotch, which is when the choking config comes into play. I just blocked down an entire 20" black locust in 5-6' pieces on Saturday using the 3 strand body. THe hardware handled it fine but the tri-line looked haggard, which reinforced the decision to go to 9/16" Husky rope.
According to Tom a 7mm quicklink will slip the RIG but not the XRR, I though I had one that would work but if it flips screw part up it wont clear the RIG. I like the fact that retrieval is just with a knot, I dont need to carry anything extra etc and can deal with not retrieving from choked configuration. I might grab the QL that Tom has just so if I ever want to I can.