I have not had any problems with the 2003 sets I bought, or the two (I think) 2003 sets I was sent. The (I think) 2002 all-blue set I got sometime in October or November 2002 along with three other sets
came with a burnt out LED, but I used the set anyway, and had no additional problems with it.
The only sets I had go out were 2001 Forever Brights. An antique candlelight set I had in the bathroom went out in early 2003, a multicolor set I plugged in in late 2003 flashed at normal brightness and then went out a fraction of a second later, and two more multicolor sets were out when I tried them in October 2003 I believe.
But two multicolor sets and an all blue set from 2001 continue to function properly, and I use them pretty much year 'round (a set of 2001 multicolor and a set of 2001 blue above my computer installation, and a set of 2001 multicolor on a stand-up shelf thingie by the front door). So not *all* 2001 sets are bad - just some of them.
I don't have any 2004 Forever Brights yet, but I'm expecting some within the next few months. Despite the fact they're
Christmas lights, I'll put them up on my
Forever Bright page when I have them.