When I am doing a really, really nastily overgrown yard, the chainsaw chaps come out, regardless of whether I am wearing shorts or pants (wear long pants most of the time - like to reduce my exposure to lawsuits from accidents caused by my damn-sexy legs). I don't use a guard on my trimmer now.
Poulan Pro PP5020AV
and other stuff I forget now!
ExMark Metro 48
ExMark Commercial 30
the bottom list should maybe get shorter, while the top gets longer, but I know there will always be more stuff!