I'm with you on this.
I've been growing indoor for about 24 yrs. Needless to say, I've owned ALLOT of ballasts.
About ten years ago (give or take), when I noticed digis in the store, I bought 4. All 4 died within 2yrs. I can't remember the warranty length, but into the landfill they went.
I can only imagine that the digis made nowadays are built better, but i'm still stickin with magnetic. I have lots of buddys rockin digis though
I/we replace caps every other year, whether you think you need to or not. It's amazing how much the caps fade, before you actually know something is up. Makes a brand new ballast. Keep an extra cap and ignitor on hand and you can fix them whenever.
I've only had maybe 2-3/100 ballasts fail due to something other than the cap or ignitor(I blew up three new ones, but that was from one single, fucked up bulb/my bad). My cheap ass friend has 8 of my old ballasts from probably 20 yrs ago. The rest, I've hooked up other people with, through the years.(and one big bust
)