I vape frequently. I average 1 gram every 4 days. I needed to find a way to reduce the cost of Stiiizys because I loved their pods and strong THC oil. I was able to successfully refill my Stiiizy pods with other cheaper yet just as strong and sometimes stronger distillate oils from other brands...
Those who are not familiar with the Stiiizy pen, they are a new company that was created barely last year. However, they have quickly established themselves on weedmaps.com scoring a higher overall rating average than all others.
Anyway, here's a great in-depth review of Stiiizy pods...