I am a COMPLETE NEWBIE with the pen and hardly think I’ve grown accustomed to it!
I still regard the pen as MAJOR more hassle than the syringe. I didn’t have to unseal and screw on the needle and then remove two more covers every time with the syringe.
Syringe was completely natural, what you see is what you get. This deal with turning the clicky knob on the pen to a number and then trusting the pen to dispense the right number of units by that last click, I’m still not sure I intuitively trust that.
Estimate of number of plastic syringes I’ve gone through: 36 years. Most of those years 4 or 5 times a day (there were a few early years where I did R+N just twice a day). So 36 x 365 x 4 comes out to more than 50,000 plastic syringes. I’m actually a little surprised the number is so small!
(Of course I’ve nearly forgotten about glass syringes with removable/washable/resharpenable Luer-Lock needles Somewhere I still have the wooden box with U-40 glass syringe, probably no needle though? What was that brand name of the cleaning solution, “Yale”?).