I used a US military chemical suit, which is what the scentlock design is based on, my first couple of years. Had some coyotes come in straight downwind of me (followed the tracks) to about 20-30 yards out. That is when they got my scent. That was back when I still called into the wind so they were coming in behind me. The only problem is the suit was so dang blasted hot that you could only use them in cold weather. After I changed my calling habits to cross and downwind I got away from using it. Then I found surplus UK suits for like $14. From my experience overseas I knew these to be a lot lighter and cooler. I use them now anytime the weather is cool enough, normally after 1 Oct or so. It fits under my gullie suit just fine and basically acts as my shirt and pants. Can't beat that, warm hunting clothes that surpress your scent for $14.
However during warm weather they get packed away. They are lighter then the US version but still way too hot.
Bottomline, I think they work and every little bit helps, but maybe not enough to justify the good ones at $250........now $14 is different, I spend that on lunch.
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"Go out early, come home late. Call all day."