John, I hope it's ok for me to bring an ancient thread back to the top, but I wanted to re-open the conversation. Amusingly enough, I found this thread while using google to try to find more more information. I guess I should have just searched here to start with.
I just picked up two FedSig TCLs yesterday and I'm thrilled with them. Of course now I can't decide if I should use them, or put them on a shelf. They're nothing too exciting (well, they are to me because they're mine and I'm a novice collector), but I'll have to post some pics. I've always been a huge fan of oscillators. I had a 2001 Impala patrol car, and picked up a Code 3 Oscilaser cheap somewhere and I threw it on the dash. That thing was amazing at night. One of the town PDs had them in MX7000 lightbars, and I'm convinved they are extremely effective.
I'm a nostalgic kind of guy anyway, and as much as I like LEDs, I hate to see these lights falling out of favor. I guess the construction was never really all that robust to begin with, but the Oscilaser as a lightbar feature seemed to do better than an auxiliary warning light, especially when mounted on the exterior of an engine, etc. My FD
's volunteer engine had a pair on the front that kept getting replaced; finally they gave up and went with LEDs.
So, I think all your points are spot on, John, and they defintely have the "really cool nostalga/tradition/shiny thing," going on, but I truly think they are extremely effective as warning devices and I'm sorry to see them go.