I bought a set last month from Amazon for $74 and have used it twice.

A 3/8" deep 3/4" wide cut in butternut was perfect. I thought I had a great
bargain.

Then a 1/4" deep 5/16" wide cut in oak was not so great. The bottom was not
flat and there was significant tearout on the ends. Maybe the tear out was
the fault of the oak, but the non-flat bottom was because the 1/16" cutter
was a bit higher than the rest.

Is it worth $74? That I really don't know. (But it beats the heck out of a
router, and that is how I was doing it before)