ok guys,i know a guy who is selling a 3x12x50 burris illuminated mil dot scope at our club.the scope is like new,he is hurting for money.i've never had a burris scope.the only 2 scopes i've ever used are leupolds and a super sniperss10x40m.how do the xtr scopes stack up to them?are they durable?any opions would be greatly appriciated,thanks.