Yeah I have pre because I have had global entry for a while (8 years now I think). Got clear because where I am, it changes wait time from 30 minutes to 5.
I went thru naturalization process. They have everything already. Including DNA, retina scan, etc. So I opted for Clear. Global Entry as well. They have it all already. May as well fast track going thru customs.
I couldn't afford to donate for a long time but I used it near daily. So now I do monthly, probably larger than average, contribution to make up for sibs from other cribs that can't afford it. Pay it forward is indeed a golden rule.
Okay really weird. I drive a Subaru and I do use a Debian VM.