I just started making CP and bought Soapmaker 3 for that (and to store my products and calculate costs, etc).
However, I do make a lot of MP and it has been really useful. Make sure you have all your ingredients and it will help you understand how much your batch is costing vs what you're selling for. Also, it keeps great inventory of your products so you know when to reorder and you don't run out when you need another 3 lbs.
Plus, it's great because it keeps your recipes and batches so you don't have to run around looking for old information or notes. I LOVE it and have it open on my computer pretty much all hours of the day