I use it and love it. It takes a bit of playing with, but once you get it down it works really well. When you enter the mash schedule for a recipe and enter your water/grain ratio, target temps, etc. it calculates the volume and temp of the mash water additions for you. Also, once you have a recipe entered, when you brew it again as a new batch, it's easy to make tweaks and adjustments.
Once really nice feature is that once you start using it, it keeps track of all of your batches based on the fermentation schedule you enter, and will notify you when it's time for a new step (e.g., transfer to secondary, keg/bottle, etc.) If you don't do it on schedule, it adjusts when you enter the actual date.
So at a glance, you can see what stage all of your brews are in, and when they are all scheduled for next steps, etc. Also, when you use it regularly, you have a detailed record of all of your past brews all in one place.
I would give it a chance. i was frustrated with it the first few brews, but once I became familiar with it I considered it the best app I've ever purchased. I use a couple online calculators for very specific things (e.g., temperature adjustments for specific gravity readings, wort dilution, etc.), but aside from those this app is all I ever use.
And no, i don't work for the company...
