Never tried a MPS as of yet but have read up on em a bit. Quite a few reviews I have seen indicate the battery life is abysmal (90 to 120 days). Have you had any such experience? I have several dots on handguns, but all of mine thus far are open emitters. Was looking for a solid closed emitter to try, but haven't decided on one as of yet.I ordered two more Steiner MPS, going to move to them exclusively.