There were 40 replies, so this should thoroughly answer your question. They also make ammunition for quite a few quite obscure and formerly obsolete cartridges, .303 Savage is one that immediately comes to mind.
I found it very reliable in 9mm, but did have few issues with .38 Special. This was about fourteen years ago, and my internet research at the time showed it had a reputation for hard primers.
I think the Czechs make some of the best ammo in the world. I especially like their factory ammo for metric cartridges like 9x18, 7.62x25 and 7.65 Browning (.32 ACP). Some years ago, I bought some .38 Special 140-grain cowboy loads that were outstanding. It is also good brass to reload.
S&B is in the Czech Republic. I reload and I have picked up S&B brass in 38 Special and its a lower quality than Federal, Remington or even Winchester.
S&B is first class ammo in 9mm. Their FMJ is loaded to better velocities than you generally see out of plinking ammo, to the point you will see some complaints of it being too hot. Such complaints usually come from those who think that weak sauce 115gr @ 1100 fps is normal. S&B is my go to ammo for breaking in new guns.
My experience with S&B is spotty. .32 acp is excellent and .380 is very good. 115 gr 9mm is under powered and inaccurate. 7.62x39 that I tried had coated cases that stuck in the chambers. .303 British had coated brass that was nearly impossible to reprime after firing and very short lived.