To me, a major trend in automatic pistol design since the late 1970's has been getting away from manual safeties. I'm not expressing an opinion about whether that is good or bad, just that a lot of pistol designs since then have gone to great lengths to avoid them: the H&K P7, the huge Glock family, the Sig-Sauers, lots of other DAO or decocker only designs, the Colt 2000, and the Remington M51.
That makes it seem odd to me that the Arex people would take a manual-safety-free design and add one. I guess it's nice they are giving people who like manual safeties AND Sig-Sauer type pistols an option, but they are bucking a trend.
At least these look like better guns than those Slovenian quasi-P-38 type guns that were surplussed out some years ago. Or were they Croatian? Dang, now I think they were.