For you, it absolutely seems worth going back. Health benefit plus money. I treat it like a checkup, too, like if my numbers are way off they’ll be among the first to tell me, make suggestions.
Trying something completely new is going to be uncomfortable! I’d give it a few more tries, at least take them for all their new donor money. You get used to it.
I’d recommend drinking tons of water, day before, morning of, just before you get on the floor. Then it doesn’t hurt if you pound some water after. Drinking lots of water can make for a much faster donation (conversely, not drinking enough water before donations can result in a slow draw nightmare).
You’re kind of asking the wrong person because I have a pretty high pain tolerance, but I say push through. Try again. Drink lots of water. If you have any questions or concerns, ask the staff. There’s not a situation you have that they haven’t seen before.
It is cheaper to have manufactured & is very much a “known”, but I’m right there with you. If it’s not USB-C, fuck 'em.