I actually bought a set with a hat. Surprisingly they are a pretty nice fit and ultra light weight for the early season except for the pants. They are gargantuan and need some tailoring.
My anecdotal evidence is that my natural vibe went away for the first three days using it. Normally if I get within 200 yards of a deer it will have it's ears up and be freaked out. Even with wind in my face they are running. The very first day I tried it scouting a few years ago I had a deer stand there at 5 yards off a trail I was walking down cocking it head as I talked to it. Never seen anything like it. The second day I was elk hunting in Wyoming and had one bull come and sniff me from inches down wind while my buddy watched through his spotting scope. A second bull walked past me down wind then came back by after watering and checked me out without blowing out. The third time I had a small 6x6 six bed down right in front of me at 35 yards. I shot that one.
Not kidding those were the first 3 days I tried the stuff. Doesn't seem to have made any difference since. Pretty sure I still have a harmonic buzz that scares the chit of out critters from incredible distances that none of my buddies can explain. That's why I carry the bazooka camera lens and film from 300 yards most of the time so I don't blow out everything in the realm.
In the end of the day, It would be nice light early season layer if it were $120 a set. At $200 a set it's marginal to even think about regardless of the claims.
Cheers, Pete