I always wanted a bass with leds, but this is the closest I've come. Twice in the past year I really could have used them. Once in a particularly dark club and another in the pit where the only light was on my music stand. I don't think I'll regret getting them in the least.
You will not regret getting them, they are pretty cool. In the situations you've been in, they'd definitely come in handy. The Luminlay's might come in different sizes? That might explain why the ones on the Kiesel's are ok, and the ones on the F Basses actually look useful, LOL!