I have a set of Rizoma Zero 11 LED signals on the rear of mine. Not cheap but they're very bright. Stock signals on the front and I have an $8.95 LED flasher relay from Superbright LEDs that makes everything flash at the normal rate.

 

Led's are much better. Led's take hardly any power on the battery, which the blink rate is faster because of the decreased load it takes on the electrical system especially compared to original halogens, not to mention are brighter. That being said, low quality (knockoff/ebay) ones are crap, they are not half as bright, taking from personal experience and experience from others, and dont last nearly as long. I have put on a competition werks integrated taillight recently on my f4i as well as a hot bodies flush mounts, besides the fact that I got an F4 taillight instead I still made it work, (mostly because I didn't want to send it back and wait when I could put on different connectors, everything else was the same) the tailight was noticeably brighter then stock as far as the luminosity goes, same goes for the flush mounts, the integrated also cost me $90 not $35 from ebay... aside from the different blink rate between the two, (Doesn't bother me personally) I love them, the cosmetics and the functionality. I would say go LED, if you spend the bones on actual good led's and not go cheap, as with most everything, you get what you pay for. I could probably go on with this, but for now, this is good enough