Are you running them with a helmet? If so, the swivel strap attachment on the Smith might lift it above the ESS. I found my Profile NVGs wouldn't seal completely while worn over your standard airsoft MICH replica, but I have a tiny head/face.
That said, I have no experience with the Smith and have nothing but great things to say about ESS and their customer service (besides the Profile NVGs I have the ICE-Naro, and Advancer V-12s).
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