Hi guys. Just wondering how useful you all, as practicing ChE's, find Perry's. As an ME, I have a Marks and I crack it, oh, once every two years, and even then it's only marginally useful. So before I plonk down the hundred-plus bones for a Perry's, I thought I'd ask you guys if you find it practical as a useful desktop tool for the practicing engineer in the process industries. I am doing a lot more ChE stuff these days, and I do frequently find the need for such information. I can usually find what I need in my other stuff but it's not as in-depth and it takes longer to get there. For example, I was looking recently for a method to estimate overall U for a flat plate-type hot water immersion coil used for tank heating. Thanks guys! Pete