Better than some.
It is lightweight for what it is, I have had more expensive ones that have not worked as well as this one. The ohm meter seems to be accurate, and the pulse function works well, But it will get hot to the touch if you fire it too much. The 510 connection did come loose on mine, But because the unit is simply put together, it is simple enough to take apart and you can tighten the nut that holds the 510 in place. Allen key bolts are under the rubber corner supports which simply lift off with a small screwdriver or similar, just be careful of the solder joints and you should have no problems if you need to do the same. All in all i would recommend this for the low price it is and it works just as well as more expensive ones.
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