Convince me

I want to buy a Haro Mary (2009) but I'm looking at a Kona Unit and Fisher Rig also. What made you Mary riders choose her over another counterpart like the Unit and others alike? Experience, stories, and comparisons are welcome. Does the Reynolds 853 ride that nice on dirt compared to aluminum? I have ridden 853 on the street before but not on the trails.

Thanks, cheers.