I've got LED lights on my trailer and they are definately nice. They are bright and don't require a ton of power. However, I really wouldn't spend the money to switch over all my lights from halogen to LED just to say that I have LED's. What are you going to gain by switching to LED? Yes, LED's have a much longer life than halogens, they are a slim design and require less electricity...but none of those things really warrants switching over all your lights.
What I would suggest, is to wait until you start havings burn out, then start switching everything over to LED. Otherwise you are just spending money, just to spend money.
'07 Chevy 2500HD
2010 John Deere Z925A 54" MOD
2011 John Deere Quik Trak 647A
John Deere walkbehind