Well I put it together and attached it to my rack...
Pretty much easy to install but getting the U bolts in the correct position is a little annoying...everytime you tighten it it moves from it's position and it needs to be in the correct spot on the barbell.
My advice for anyone deciding to buy the FS is to tighten the U bolts as tight as you can and get it ( Not Too Tight ) where it doesn't move too easy this way you can tap it back into place and then tighten it really good. Once tightened it doesn't move so no worries there. Best way to do this is to have barbell resting on your sabers while installing U bolts.
Also..do not attach U bolt while rope clamp is attached ( Comes attached) . Remove Rope Clamp beforehand ( 4 screws and easy to remove ) it will make it alot easier.
The Bowline knot is a breeze and really secure and pulling rope thru the rope clamp is simple..just open clamp and pull rope thru .
I proceeded to load 600 lbs ( I only have 600 lbs ) while having the sabers about 1 " below just in case. As I was loading this weight I thought it was slipping some and when I got to the last few weights 10's and 5 's the Free Spotter was resting on the sabers completely.
I then remove the sabers which was very hard to do with 600lbs resting on them..whew !
It move about 1 " total when hanging on it's own but this is expected . It wasn't the Free spotter that caused it to move..it was the new rope stretching which is normal. I put a piece of tape on the rope to see if it move anymore and let it hang in that position for a good 25 minutes or so. It might have move maybe 1/16th or 1/8th of an inch more and that's it .
When the barbell with weight is hanging the rope clamp clamps down even harder so no worries at all ..it will stay for sure and I feel very safe with that .
The only thing that i can see that will need to be replaced over time is the 2 little springs that attach the skinny bar (That you squeeze to barbell ) to the rope clamp. This isn't a safety issue at all because if they get too springy and stretch out it will cause the system to lock up

Pulling on the bar against the barbell opens the rope clamp so you can move freely..if the springs don't stretch you can't pull on it to open clamps to move up and down.
Bottom line ..if the tiny springs get worn out ( Lose spring overtime ) you won't get hurt because it locks up. Plus you can buy these springs in Homedepot or hardware store for 25 cents I imagine.
The only other thing that might wear out overtime is the cable..kind of like airplane cable ( Thinner then a cable crossover cable ) without the sheath on it. It's attached to the rope clamp and the tiny springs on both ends of the skinny bar and each cable is only about 5 - 7 inches long if that. Again..if they did break it's not a safety issue because the rope clamp will just lock up.
Now the actual testing..
I removed all the weight but left 135 lbs on and did some bench pressing.......
It works

No problem at all..moves freely and no bunching up of rope and works as promised.
Tomorrow is leg day so I will go to town and test it doing deads and squats...
Listen..It works and it's safe and I know I would feel %100 safe using it without a rack which I intend to do.
The only real worry is when attaching it to joists...this is where you have to make sure you attached it correctly and be sure it can take whatever load you will be using. The free spotter isn't the part that will fail at all...it's how you attach it to your joist...if you do that correctly I say get rid of your rack and gain some space for other equipment which I intend on doing .
Well that's all I can think of for now
PS: One thing I don't like is the color of the rope ..Horrible....it's white with tiny blue dots all over it.... I thought the rope was Red like in all the video's . I seriously have to change this rope..it doesn't match anything in my home..plus I can see it getting dirty after awhile UGH !
Blue