As far as I'm concerned, the only reason to get the 150 instead of the 100 plus is if you want to build between .1 and .15 since the 150 can handle .1 and the 100 stops at .15 resistance. For me, I am getting both but I'm stupid. Otherwise, get the 100 plus or wait till there is a 150 plus. No screws and a spring 510 pin are worth it.