I am reluctant to say they are good as someone will show up claiming they are bad or something,
But the last several engines I ran worked quite well though. The engines are pretty good, but there is some risk that the carburetor may have problems.
Now a couple of years ago I ran a couple of .61 four stroke engines and both engines worked Ok, but I needed to slip on a short piece of fuel tubing to stabilize and center needle valve on the engines. The different two stroke engines I ran all worked well and didn't need any tweaking.