LED-type christmas lights have really come a long way. I bought a dozen boxes of them back in 2005 (C7-style, or what is called a strawberry bulb) and a problem I've had with LEDs is their lack of sparkle. They tend to "glow". This would only be a problem for those that love the sparkle that mini-lights give (me, for example). There are newer 5mm ones that are dome-shaped and claim to be multi-directional. I've seen these on trees and they look very nice. They have more sparkle than the C7 style.
5mm LED lights
Thanks for the compliment on my tree! I'll be shopping for more lights this year after Christmas. lol!