bubbastain,
The red you see on the primers is primer sealer, to make it more waterproof. S&B has been in business for many, many years, but since they were behind the Iron Curtain after WW II, their products were used only in the Eastern Block countries. Your XD was probably test fired at the factory with S&B ammunition. At least my 357 Sig XD was. Some people have reported problems with it in their XD's, but since I only shoot my reloads, my only experience is with their brass, and it's pretty good quality.
Magtech is made in Brazil, and is also pretty good quality. I use some of their bullets and they are well made.
You didn't mention Armscor, which is made in the Phillipines. I have used their .38 Super ammunition, and while it's not loaded as hot as I like in that caliber, it was very accurate and the brass is still holding up after many loadings. Sometimes you can find it at a very good price, too.
Sounds like you hit on some good deals at the show. I wouldn't use Wolf Ammunition, as I've found many of Wolf's steel cases at the range that were split. It also leaves a heavy residue in the chamber and barrel from the shellac on the steel cases. I also don't like ammunition that can't be reloaded. Seems like such a waste.
Hope this helps.
Fred