There aren't many items I describe as "life changing," but this is one of them. It's so much easier to cut out fabric now. I still need to switch back to my regular scissors for some parts since, though these are great for straight lines and curves, they're a bit tricky to use with tight spaces at awkward angles. I can't speak for battery life at this time since I typically usually only cut out a few pieces a day since cutting is my least favorite part, and it's less tedious spread out. These make cutting go so much faster, so I'm able to get more pieces cut out per day in the allotted timeframe, which is wonderful. The heads are a bit tricky to switch, and you need to be good at real-life Tetris to make everything fit in the box, but overall, I'm very satisfied and wished I'd purchased these sooner.