Hey what's up! I'd like to know what is the toughest, most rugged, heavy duty, reliable, bullet-proof walk behind brushcutter on the market (properties not big enough for a tractor pulled bush hog). Although I value everyone's opinion, I especially want to hear from anyone who uses one on a regular basis (if there are any). What are all the brands available? Is there one that is "commercial" duty (meant to be used daily that won't tear up under heavy duty), like we use our ZTRs? The unit I'm considering is the Billygoat Outback. I know DR makes one but don't know that it would be considered commercial grade. . .same thing regarding Troybilt. . . but I'm open for any and all suggestions. For whatever brand you recommend, how is parts availability? Thanks in advance.