MathUSee versus Saxon?

I do have a couple of questions for you! Thanks for such a great explanation of Saxon - it’s helping me to understand the program a bit better. I like the additional skills practice it gives - I think that would maybe give me son some more variety in his lessons and would help retain his attention a bit better.
1- How ‘teachable’ is Saxon? I like MUS b/c it has the DVD that does the teaching (granted my 5 year old definitely still needs the 1on1, but I’m assuming the older he gets the more capable he will be of independent work). You mentioned a CD for your older ones - is that how the lessons are taught?
2- How are your boys at learning? Are they ‘typical’ boys that can have a hard time sitting still or focusing for periods of time? My son just doesn’t seem to enthusiastic about school in general (even though we’ve kept Kinder this year to the bare minimum of reading, handwriting, and math), so I think that could be part of it, but I do think he could also use a bit more variety/excitement in his math curriculum.
3- As much as I like the variety of the lessons that it sounds like it has, does it take a lot of time? I like that right now we can take 3-4 days on a lesson and just do 20 minute chunks since that’s about all he can handle. Is that workable for Saxon?
Thanks so much for your help!