I really like BeerTools Pro and feel it's really worth the $30. It takes a bit of getting used to, but is pretty powerful. Inventory control is good. I just did a complete re-inventory of all my ingredients. I love to drop different recipes in the 'Planned' folder and see how my inventory matches the ingredients. When I brew, you tell it to deduct the ingredients from the inventory. You can set up multiple recipes and get a shopping list for any or all of them.
You already know the software from the free trial, but sometimes the features can be less obvious. Reading the BeerTools forum has helped me understand and utilize many of the features. Our own BobbyM has links on the BT forum to videos on calibrating BT for your heat sources and equipment.