the casting looks pretty ordinary to me. That's the only indication you can get of quality by looking at pictures of them on the web. My gut says avoid them and buy the proven name brand stuff locally for less money.

I've had a few sets of secondhand Solex, Dellortos and Webbers and never had to do anything other than tune them to suit the engine I was fitting them to. You're going to have to do that with these new carbs anyway, and hope the manufacturing tolerances are such that the Weber stuff will actually fit (more worried about chokes and stuff than the bolt in jets and emulsion tubes.