I have trijicons on 2 Sigs and they are good, but I have Mepros on a P7 and I like them just as much, if not a little better. The Meps seem to have slightly larger white rings and as far as toughness, meps are Isreali military standard issue and the P7 has some of the quickest slide velocity of any handgun made, and mine are holding up fine after 5 years.
Heinie and Ashley are innovative and well crafted products but I can't personally consider them because I train myself on 3-dots and I've been told it's best to stay with the system you're used to and train with.
pojim