I've always thought those are pretty interesting, in the sense that they're rare and expensive but so much less cooler than the regular carts you can get for $5. That led is awesome.
That is my feeling about them as well. Cool variants, rare and expensive. But the LEDs in the cheap versions just look so bad ass when in use, so I am not sure that I would personally pay a premium for these.
Curious, this variant exists for how many games? Also, what price do these typically command?