440 six pack pistons and some questions

I literally spend half a day trying to find pistons, long story short No-One had anything worthwhile, finally the guy at united gave me a L2355F.30 and said these were good pistons, comparable to what he initially suggested to me ( that was currently manufactured from unobtanium )

I bought these on E-bay, item # 190856082388

No I didnt want the cheapest piston, I was ready to lay out for some JE pistons but there were non available 440 .030 over.

What can anyone say about these, considerations I need to take during my build?

Secondly why did I have to pay sales tax, hes in Tenn and Im in Florida, I payed it cause I figured that if I found out later it was a scam I could do something about it then.