I've been in homes with these tube skylights and I personally don't care for them. The light bothers my eyes. Don't know if it's too concentrated in one place or why it just looks so unnatural. I have regular skylights in my home (and garage) and they provide good daytime light. I would suggest you find someone that has them (or look at model homes)before you install them.

i live in the south. this means solar tubes create intense heat in the upper hotter regions of rooms. also, with as much rain as me get its totally bad to disrupt the roof with another hole. in short the hotter regions stay away from it! in the colder regions... its free heat, and needed light. so do what you need to in the area you live in!