EVS is junk.
Alpinestars brace is ok, but they don't really work with too many chest protectors
Of course, Leatt started it all.
But, the newest one out is the Atlas brace, and it's what I'm wearing.
It was designed and the company is owned by a Canadian.
The design of it is great, The materials are top notch. The function of it is similar to the Leatt, but it takes the contact points off of the collar bones and sternum and spine and puts them on the shoulder blades and across the ribs. There are benefits and drawbacks to either system. It's not as rigid and the Leatt, so it will work with your body a bit better, but it's still more than enough to do the job.
It's also easier to put on and off as it just slides over your head. I have mine rigged up so that it comes on with my chest protector but the emergency release function will still work.
With the Leatt, you have a clasp to put it on and take it off. I've seen this clasp come undone during riding and the brace then becomes an issue.
The Atlas is the only brace I could find that for me would work with a chest protector, aside from going the expensive route and buying the Leatt neck brace and chest protector. The Atlas comes with more fitting adjustments than any other brace. I'm born with big shoulders/chest so I had to wait for the Atlas to come out to finally have something to fit me.
The first time I've had it out, even on the first lap I didn't notice it was on. Everyone at the track is interested in it, even the Leatt users. I've loaned it out for people to try and they all like it.
Best of all, the Atlas is quite a bit cheaper than the Leatt.
The production of the Atlas was delayed by Leatt attempting to sue... That's how much of a threat Leatt thinks the Atlas brace is to their market share.