I have been very pleased with my MatchDot as well. I have had it on my 44mag Bis Hunter for about 10 years and after thousands of rounds it has not moved....i.e. I can't ever remember having to rezero it other than when I have changed loads.

I have a BFR in 500JRH on the way and I am thinking of giving a Holosun 507 green dot a try. I really like the idea of a green dot and reticle, but I am a bit unsure if the Holosun will hold up to such a big boomer. If it can't handle the JRH then it will get replaced with either a DPP or an Ultradot L/T.