First the good. The idea behind this application is sound and well suited to a device such as iPhone. If it performed half as well as I had hoped it might have some useful purpose to serve in my life. Sadly it doesn't and in it's current version is, for my purposes, a useless waste of money. First problem is that it is limited to a maximum of two decimal places. Second problem, and this is the kicker, it allows you build in a limitless (in as far as I could tell) number of variables into your calculations, and who wouldn't want that, but when you then go to build your Result a max of only five of those variables are available to you to do the job. This is annoying beyond words because I initially tested out the app with only three variables to see how it worked, satisified, I got down to business building up some stacks for a presentation I have in the morning only to discover that they (my stack of variables) were useless because the app only allows you access to five in building any result. A complete waste of time and money. I was so taken aback I thought I had actualy got the "Lite" version of the App but no this "two decimal place," "five variable" lightweight toy is apparently the Pro Version I paid for. On the appearance front it ain't particularly good looking but it's essential design flaws are what's going to hurt the customer. Again it's a nice concept but not ready to be let loose on the paying public. This thing needs updates and fast. If it gets them in the areas mentioned then this could be a really excellent product but until then it's nothing more than a toy. My advice is not to buy this until it's updated to something a bit more serious, when that happens i'll be back to change this review and whack up my rating. The author deserves credit for a smart concept that's tailor made for devices such as iPhone or iPod Touch. In a short while, depending on quality and timely updates, he'll deserve your money too. Edit: latest update addresses one of this applications major limitations and with it greatly improves this promising application. Now it appears to allow you limitless variables and thus renders this application suddenly seriously useful. If the next updates bring extra decimal places (still a crazy omission) and a serious UI makeover then I'll be delighted with GoFigure. As it now stands this is a useful application enough to now bump it from two stars to three.