I just got an Aimpoint CompM2 from a friend of mine for $250

It's already mounted on my AR and I'm hoping to be able to get out and do some shooting with it this weekend. Anyone have this sight or a comparable type? Good, bad? Thanks.
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USAF Retired
Far better is it to dare mighty things, to win glorius triumphs, even though checkered by failure... than to rank with those poor spirits who neither enjoy nor suffer much, because they live in a gray twilight that knows not victory nor defeat.
Theodore Roosevelt
Don't sweat the petty things and don't pet the sweaty things