We have used used Alpha Omega (Life Pacs and SOS) in the past and my kids always test in the top 10% or higher in the state. Then we switched to Bob Jones for a year and went backwards!
Now we RE-DID that year and are back on track with Alpha Omega and will not switch again.
Plus the Bible curriculum is second to none. Most well-studied adults cannot compete with the Biblical knowledge my kids get from it. That would make it all worth it for us even if anything else was behind (which we do not think it is.)