Thank you all for the info so far. Pre-lits can be expensive and our tree is in good shape, so we wanted some info before we went out and bought a new tree.
I've shown my husband your responses and I think he may be reconsidering it. He said we should maybe look into it again in a few years when the LED pre-lits have been out a little while longer (and possibly become cheaper) and then get some feed back on it.
If we want to save energy, we might buy a few strings of LEDs. All our outdoor light are LEDs and the soft whites actually don't look too bad. I agree on Christmas trees they can be a little hard on the eyes, but they are getting better at making them resemble more of the classic lights.