LED's look great.
I use them mainly for inserts and the backbox, I use them in GI if an area on the PF looks a little dark and needs a bit of brightness.
I don't like LED kits as I like to experiment with different colours and effects and LED kits are not cheap.
I have only ever bought cointaker LEDs and have had the odd dead bulb here and there but nothing to complain about.
I have never got any LED's from rtbb but everything else I have purchased from there has been great with top service, price and postage...I will give them a go for sure....my newest additions have not been done yet.