Ease of maintenance is also something to think about. Make sure the cutting teeth are easily replaceable. Hale says some brands feature teeth that are built right into the cutting wheel.
Safety and support
Finally, as is the case with all power equipment, find out about the various safety features the trencher offers.
Make sure you're buying from a quality servicing dealer who will be able to provide you with parts and service in a timely manner when needed.
And don't forget about rental as an option. If you only think you'll need a trencher a few times a year, renting can be the way to go. But if you think you'll get at least a couple full weeks' use out of it, Hale says purchasing likely makes the most sense.