Speaker Height - big deal?

I know I've seen coutless posts about speaker stands and what is the best speaker height, so it seems obvious to me that most people here think that is somewhat important. But my question is, for the low end user, does it matter? I recently got those Best Buy Insignia speakers to replace the fronts and center that came with my Onkyo 570 (entry level HTIB). Obviously the Insignia's are a huge improvement over what I had, but I've got them sitting on top of my entertainment speaker, so they're about 6 feet in the air.


I'm wondering if I'd notice a huge improvement if I got some speaker stands and lowered the speakers three feet so they're at or around ear level? I've hesitated doing this because I have a 3 year old and a 1 year old, but if it is a significant improvement, I could probably come up with a safe solution. Or is speaker position one of those little tweaks that a non-audiophile like myself wouldn't even notice?