I still have a couple of those PlanetX Superflash clones in regular (though not heavy) use. Admittedly with a strategic elastic band to stop anyone wanting to nick them the front half ejecting when I fail to avoid a pothole. There's also a real Smart one somewhere which got removed from the Red Baron to when I replaced the rear rack with a tailbox.
My Radbot1000 (which is a better-engineered functional equivalent to the Smart that also uses the same brackets, and must be about 10 years old) has just been transplanted to my new Streetmachine, on the basis that I came up with a suspension-friendly bracket bodge and didn't want to have to change it. It only gets switched on for night riding and shite weather, but it's been on the bike for thousands of miles without trouble. That one's notable for introducing a sinusoidal throb mode as an alternative to hard flashing, which I reckon is a good compromise between attention-getting and melting the BRANEZ of following riders. Sort of thing that makes sense if you're not riding in a group per se, but expect other cyclists to be around.
My primary rear lighting is rack-mounted dynamo lights like dog intended. Mostly from B&M. Notable not just because it's a steady light, but that it consistently points in the right direction. Partially-arsed light attachment (bouncing around on soft luggage loops, seatstay mounted and aimed at low-flying aircraft / into the eyes of following riders) can be as problematic as actual flashing modes IME.
