yes, DEI owns clifford now, but most of the cliffords are still different...
you won't see Viper or Sidewinder or Python with Blackjax built in
as for the switch, i have had my Blackjax for 9 years now, it wasn't in use for 3 of those, but in 6 years of everyday use, i just a few months ago replaced my switch, and that was only because i opened my sunroof when there was water collected on it from rain, and it seeped right onto the switch ruining it
now that was the first generation of Blackjax and while the new ones do use a totally different switch, i would put faith that DEI/Clifford still uses high quality components