One thing to consider is that if you sometimes use smaller engines, you will have to break them in without a muffler if you have a test stand with the bolts facing up (esp. with wingnuts).
I thought my old test stand was an E-Z Just, but upon checking I can faintly see "Perfect" on it. Did Perfect make the E-Z Just stands? This ancient one is from the fifties.
The one I use for larger engines is from about 10 years ago, also wood (came in a kit) but I can't remember the brand name. The brand name does not appear on the stand, just on the assembly instructions.
George