Mark's right...you get what you pay for...BUT. As a homeowner and hobbyist I buy medium quality tools for use around the house that I use a lot...battery drills, powered drills, sabre saws, ciircular saws, etc....some Mikita, some Craftsman, so Riobi...no Milwalkee or Hilti or DeWalt...which I'd love to own but are just too expensive. If I were a professional contractor, I'd REALLY understand buying the best stuff.
But for the infrequently used tools, I buy em at Harbor Freight. I have their hammer drill ($60), their itty-bitty electic concrete mixer ($99), their bisket joiner ($40)...and a lot of weird hand tools and clamps...and they work just fine. The hammer drill is a great investment for GRRing IMHO...it goes through concrete like it's butter...and it hammers alone....so it's a little jack hammer too.
I've not heard of Denali stuff...but almost ALL of the powered hand tools are now made in China. In the last two years just about ALL of the tool makers have shifted their production to Chinese manufacturing. That means that the molds and casting masters for most powered tools are going to be copied...and with cheaper motors, gears, and castings produced as cheaper versions of the "good" designs. And outfits like Denali, or Chicago (one of Harbor Freight's brand), are gonna see a lot of action.