Don't know where you read that but it has to be really old. WinISD Pro (Alpha, some say alpha, some don't, I think it's the same thing) is the one to use. Much more detailed with things like actual port air velocity rather than pass/fail, max. power graphs, etc. The only thing I wish they carried over from beta that's a bit handy but not really "needed" was the box builder, dimension calculating thing. It saved a step of simple math, that's all. For example, if you need 4 cu.ft. and enter 2 dimensions of your box, it gave you the 3rd one needed to hit your goal, that's all. It still didn't calculate space taken up by ports, drivers, etc.