I bought one of the Longacres but had to return it because there wasn’t enough space between my halo bar and the roof to fit the really nice machined brackets that it comes with.
I ended up with a cheapo IOPort racing curved mirror that worked ok until last Saturday when one of my codrivers busted it off during the EMRA enduro. It wasn’t very sturdy but considering show little it cost ($19?) I could replace it every season if I wanted to.
However, I think I’m going to replace it with a Wink. Our regular enduro car has a Wink and I think I like it just a tad better than the curved mirror. The only problem with a curved mirror is that it is hard to judge distance in it.