Harbor freight has their motorcycle wheel chock on sale for 10 dollars off. Seems to be well made but haven't tried it out yet. They also had a weel balancer in the local store near me. Did not look it over just saw the box. I already have the Marc Parnes.
I bought one of these the other day and put it together. Its appearance and functionality suck compared to the Condor which it knocks off.
They've cut several corners, which of course one would expect at the price point. The pivoting back gate is fixed in location, and you make your adjustments by moving the front post, so that may be how they get around any patents that Condor or others might have.
I could personally live with the low quality appearance if the function were good. The instructions for the Harbor Freight version specifically say that you should not "ride in." If you try to push the bike in, you've got to push it in over the hinge pin. This causes the thing to scoot around on the floor unless you tie it down securely.
If you can afford the Condor, the fit, finish, gauge of metal, and functionality are all superior. The Harbor Freight version is like so many other Harbor Freight products - you send your money to China, and they send back a POS built by coolies in sandels standing over an open forge. I got rid of the Harbor Freight chock.
I suppose YMMV, but this is dependent on how critical you are of your mechanical stuff. I would not trust the Harbor Freight chock on a trailering application because of what appears to me to be poor quality materials and workmanship, and IMO its pretty worthless as a garage floor chock because of the difficulty of pushing the bike in and its need to be tied to a specific place.