After going through the injector pen threads, I went ahead and ordered the V4 set from Good Life Supplies, and I've been using them for a month now. I'm happy with them, but the sheer number of pen needle tip options has left me stuck with consumer paralysis. I picked up some 6mm and 8mm, though I've since read that those aren't ideal for subq. Would 4mm, 5mm, or something else be better to buy? And with so many brands out there, which do you like and why? Thanks!