It will not hurt to try/use the 'cheap' tool. You will quickly find out if it will work for you.
My guess is that the barrel aperture will be of sufficient quality to work as needed.
Some of the other features may not work as well as they might on a better quality or design, but it will probably work.
I find that the buffer tube castle nut can be a bit tricky with my DPMS tool. If you build more, you may end up with a couple of armorers tools/wrenches.
My builds have been successful with my original DPMS tool; I often find criticism of this design on the forums, but it can work.
The only reason I haven't upgraded the tool is because it DOES WORK and I'll put my money somewhere else.
IMPORTANT: if you think the tool is contributing to any damage during assembly, seek more advice from others that have tried different tools.
I still get annoyed inserting the Mag Release Pin.