We use ABkea. I have only had to use the teacher manuals to grade a few sheets. This is however my 2nd child in K, so I didn't need them as much this year as last. I probably won't use the 1st grade ones as much next year either. We LOVE ABeka.
I've used timberdoodle for kinder & 1st grade and will use it again for 2nd grade. I really like it. I supplement with my own science though....for first grade, it comes with an astronomy book. My daughter really enjoyed it, but we couldn't focus on one topic for the entire year. Their history book is amazing (I know its called history of the world, but I can't remember who publishes it). I like the math too (again, I can't remember what its called).