I ordered some LaserFlex awhile back to make a T-shirt for someone. I had an idea for another shirt but, an optimal color was not really available. Later, I learned about Siser EasyWeed, which is available in a lot more colors. With some of both on-hand, I tried both back-to-back. Both seem to be workable with minor differences. Ironically, the LaserFlex was easier to weed than the EasyWeed. That may have partially been due to where I settled with the settings.
Conveniently, I had an old heat press sitting around in a closet (doesn’t everyone?) to do the transfer.
Score (film but not backing): 300 speed / 5 power
Cut (film and backing): 300 speed / 15 power
Engrave: 1000 speed / 15 power / 3 passes 
Application: 305º F, pre-warm shirt a few seconds, 10-15 seconds at medium pressure to transfer, peel hot or cold.
Score (film but not backing): 200 speed / 6 power
Cut (film and backing): 300 speed / 30 power
Engrave: 1000 speed / 30 power / 1 pass
Application: 350º F, pre-warm shirt a few seconds, 30 seconds at medium pressure to transfer, allow to cool, peel cold.
In addition to vector cutting and weeding, I was able to engrave for finer details. That might be good for small text, for instance. Neither of the current designs called for that. So, I just have a not-very-photogenic test patch. I used the test to calibrate my heat transfer technique and, get a reminder lesson about hot vs. cold peel. So, the ghosting is entirely the product of that. The nice, crisp edge on the left side is what I would expect. Note the inclusion of the T-shirt cuff stitching for scale.