I’m a Full Spectrum believer, and I vape FSHO/FSO as my 1st breakthrough pain med. The dispensary carts for ‘Live’ or ‘Full Spectrum’ cost $55/.5gm. ???? NOT when I can buy 1gm of FSHO for $48. So, a year ago, I found CCell carts here. GREAT HITS, multiple uses! Keep the mouthpiece clean, vape them to empty if you want to refill them – simple, basic stuff. I’ve been a regular customer ever since my first purchase. I find the 1gm carts easier to fill, but, I admit that I must take off the fluted top & wipe the small, center post rubber ring clean and clean the mouthpiece halfway through the gram or I risk the oil dripping down into the center. (I clean w THIN, not dripping alcohol pads.) However – why buy 2 half gram carts for the same price as the 1 gm? So, now I buy ALL one gram fluted carts. They hit fabulous & I usually get 3 or 4 refills per cart! The fluted shape is easier to draw, and I’ve tried every shape. I think it’s that the lips are closed, perhaps. CONS: 1) Carts from when I used the Preheat function of the battery – didn’t last past 2 refills, and I vape low at 2.5-3watts. 2.) When a cart gets left with enough FSHO to cover the white circles around the bottom of the center AND didn’t have the top & bottom pieces put back onto the cart – it tastes terrible & burned. I’ve lost carts on their first use to this. Nowadays, I avoid that by vaping every cart to totally empty, for refilling; as well as ALWAYS replacing the bottom AND top silicone pieces on ANY CART not in current use. I believe in the importance of keeping ALL loaded cartridges as airtight as possible! I ADORE THE FREE LANYARDS – and I’ve been asked about it, so, it works as advertising; I bragged about the AMAZEBALLS customer service team. I had a problem with an order – they were responsive & fixed the error. Go w CCell & Hamilton – great product, great American company!