1) Operator error with remote and volume problem! Doh!
2) Played around with adjustments on Sony Wega HD TV and am very happy with the SD channels now.
3) I see many people saying that their 4100 is very, very hot. Mine is hardly luke warm, even after playing for hours.
4) I don't have the problem with the sound drop out, although I haven't tried he optical cable yet.
Basically, other than having to put my sunglasses on just before I go to the program guide, I am very happy with my little 4100.