All replica optics are absolute sh*te, I've tried near all of the 'good' ones (including many rmr's) on pistols and rifles, they are all junk. Be it a red dot or holo, if it's ACM no matter what 'brand' it's gonna be sh*te
Depends though, you might be happy with a clone for your intended use. If your MK23 is a upgraded heavy hitter then treat it to a trijicon.
miss my MK23, awesome pistol when done right.