Like anything else, you get what you pay for. I have/had the HF brand Pittsburgh Torque Wrenches. Have no problem with them. However, don't use them for engine work either. Sears sells a decent torque wrench. Check the sales, or when they put the displays in the aisle. After paying $29 for a Craftsman Torque Wrench, I sold the Harbor Freight one I had.
At work, I have a Snap-on 40 to 250 ft lb torque wrench I bought in early 1980's when working in garages. In 2012 had it checked and it's still good. I also have other Snap-on in and ft lb torque wrenches and a electronic tech-angle (nice) that will measure in in lb, ft lb, and nm.
If your torquing lugnuts, assemblies, drivetrains, etc, then a cheaper torque wrench should work just fine. But for engine rebuilds, hydro pumps/motors, setting backlash, etc. spend a few more dollars and get a little better tool. Not saying you should buy any specific brand, just something better than a hardware or discount tool store's brand.
For what it's worth, your tool, you make the decision.