We are currently using SOTW and they all 3 really enjoy it. I have been reading the chapter in SOTW to them, then they do the workbook pages and we all head to the library and find more book on the topic we are learning about.
For math we are using Khan Academy w/some worksheet supplements. And playing around with Saxon to see if it will work. It seems to me that Khan leaves gaps in their learning so I doubt I will ever be able to use that solely, but I really think it's a great resource.
I have just purchased the Real Science 4 Kids and am looking it over to see what I think, then will present a few sample lessons to the kids to see what they think. We usually do much of our science outdoors in nice weather (so we have not done much, if any, science during the winter months).
We are all out of doors type people, so when the weather is nice we will do school work at a park, or the front yard, or wherever feels nice to us. :) So books/activities/etc. are nice to find that can be toted around.
We have a variety of vision games; block by block, brick by brick, tangoes, rush hour, rush hour w/trains, flash focus, and several apps that they are allowed to use occasionally.