Tools

You can never have too many high quality tools that you can use.

You can easily get suckered into thinking that you have the right tool for the job only to find yourself with a real lemon that takes more maintenance time than it saves by using it.

You can occasionally luck into a tool that is more useful and time and labor saving than you ever thought possible.

I still haven't found a good way to tell a good tool from a bad one when you have had little or no prior experience with it.

Older tools that are simple and in good repair seem to often a good idea, and usually work out well for the price spent, the problem is knowing how good of repair they are in as they get more complicated.
Tools designed to do lots of things are often less reliable at all the jobs and more expensive than just getting each type of tool separately.

New tools often work adequately at first but prove they don't have much staying power.
My 1973 'John Deere' garden tractor has required just as much maintenance as my 2013 'Property Master' snow blower/brush mower.  And the cheap-ish regular mower for grass works almost as effectively as both of those combined for clearing the land of brush. What is up with that?!?!

If you don't have previous experience with performing a task, before running off and buying a new tool to perform that task, ask those with experience HOW to do the task, and what tool they would use before asking WHAT to look for in a tool. Heck, they might have a spare they would be willing to part with for a pittance, or know a common 'gotcha' that you might run into.

Back to the tractor, brush mower, and standard mower.
When I asked a couple people who have had experience what I should be using to clear the land they both recommended a whole different tool entirely- a gas powered heavy duty weed whacker (with add on metal blades). The three other tools that I was trying to use set me back between them almost $5000, PLUS maintenance costs. The weed whacker plus metal blades should run about $600 based on the window shopping I did after getting the recommendation. Also since the weed whacker isn't supported on wheels I wont break it by having it fall into brush hidden holes like I almost have with the other tools...

Learn from my mistakes, take it slow, make certain you are getting the right tool for the job (ask those who do to know for sure), and choose simple single purpose tools that will make the task easiest on you. Don't be afraid to pay a little more for quality but don't assume brand name or price necessarily means quality.