The 1st Gen TL6 is so awesome, it is the bass Roy Vogt based the design of his new Kiesel/Carvin Roy Vogt Signature Vanquish 6 on. If you look at that one, you can see it's almost identical. The only real functional difference is the Kiesel has mid-frequency sweep, but no passive tone control. And the Kiesel is a bolt-on neck.
IMHO the TL sounds much better in passive mode. I doubt I'd ever get a 2nd gen and be stuck only 'active'.