I have been brewing a long time, about 21 years. I've gone from that first Mr Beer Kit, as well as brewing a milk stout in a used milk jug, all the way up to a $1500 system involving stainless steel pots and kettles and multiple insulated coolers with brass and stainless fittings.... I stumbled upon the Beer Recipe Calculator here on this site a couple of years ago and have been using it ever since. I have made about 7 batches with it, from starting early on just to consult with it to check some things that I wasn't sure about, to like the last 2 or 3 batches using it from the very beginning to design recipes from the ground up. I am amazed at how accurate it is. From final colors coming out right on target, to hitting target gravities to within a few hundredths of a point, to predicting how bitter a batch of beer will turn out. It sure takes the guesswork out of the whole process. I originally was hesitant to use it as I thought it might take all the fun out of brewing. Seems to take a lot of the headache out of the whole process, so I think that's a fair trade-off. Have I just been lucky so far? Seems like so much can go wrong with this hobby that a computer program just couldn't reliably account for everything. Are others having success with it, pretty much all the time? Anything major that I should watch out for?