Yeah i had only used 250 before and that went in smoothly, my first time using this I could barely walk the next day (Quad pin) after that I started either heating it with a blow dryer or leaving it under a heating pad for a few mins before pinning. It was insanely thick compared to 250. As for Labels from what I've seen/read if theirs a hologram/detailing its probably legit fake shit most of the time is generic w/ no exp date/batch number etc.

Also I bought two vials of 450 and one was slightly darker than the other, any idea what that could be? They are suspended in almond oil.