I'm in the process of evaluating the new JEB's 20 gauge turkey chokes for Rem-Choke and Win-Choke threaded barrels. The JEB's brand got the attention of everyone when Bobby Sears used one of their 12 gauge chokes to win the Hunter Class World Championship this year.
The 20s have just been introduced, so I thought I'd give them a try and see how they worked through a few different guns. It's been very wet and cold here in Southern Illinois but I'm getting out to my range when I can and shooting at some "big paper". I'll let you know what I find out as soon as I've been able to shoot enough shells through them to fairly evaluate this new offering.
P.S. I'll publish a full evaluation and "Product Test" article at http://www.allaboutshooting.com as well.