I've been using it exclusively since almost the beginning, give or take a week maybe and it has produced 7 batches of soap... The only thing I can complain about is the fiddly oils total/mold capacity part (which I've mentioned here long back) and the additives that revert back. Other than those I love this calc! I have a question though, and excuse me if it comes across as stupid. When I made my first soleseife, the additives part of this calc wasn't fully functional yet. I had calculated my oils and water on the calc, and then manually calculated 25% of water for my salt. I had not written in the notes part coz if I remember correctly that wasn't there yet either. I did write in my notebook. I was gonna try again recently, but noticed if you input the salt amount (instead of in the notes) in the additives section, the lye and water amounts change. Which now is the correct water? The before or after the salt? It's not an issue at all, but if it's the before number, do I just keep writing the salt amount in the notes instead?