I have Sims LEDs on my Sei 5. I have chosen to have only the side ones just for me to see in a very dark stage. The same option I chose for my Custom Empathy 5 Status Graphite (Status' own LEDs).
Initially it's nice to look and impress but I don't think I will ask for LEDs in another bass. Then again I will not go for a J bass either

. Anything that makes the person happy it's OK (within reason of course)