We started homeschooling last fall, but our kids are much older (15 and 12 now) and had been in parochial school since kindergarten.
We chose Seton, and would do it again, because to us it most resembles going to school. They provide lesson plans, teacher support over the phone, and if you register with them they will grade about half of the tests and provide you with transcripts - which for us was important because our kids are likely college bound. While this certainly isn’t necessary, we feel like it may open up more doors for our kids as they pursue advanced education.
The curriculum is mostly great. Most of the subjects have text books that have our faith weaved into them. My son’s biology book is actually a science book. It presents many of the scientific theories that are mostly accepted as fact in our culture today, but it shows them with the light of the faith - which often helps my son come to his own conclusions about the holes in many of these theories.
Seton uses the Saxon math curriculum, as most do, and it’s absolutely fantastic.
Some of the subjects are quite difficult, but we appreciate the challenge for our kids. Overall, I love how the faith is included in nearly every subject, at least to some degree. In private school, religion was just another subject. With Seton, it’s a part of everything - as it should be.