Typing on the BlackBerry STORM can be quite difficult if you have long fingernails. I try to keep mine relatively short, so it's not a problem that I usually encounter. However, if you like to keep your nails on the long side, then you may want to go with a device that has a hardware keyboard.
Remember, the STORM doesn't have a passive touch screen like the Palm Treo. Instead, it relies on capacitive touch like the iPhone. You can't use a plastic pen or any other passive stylus on the STORM. This is important because many people think that a "touch screen" = "touch screen." However, there are several differences between passive touch screens and capacitive touch screens.
Well, enough about screens. The STORM is fast and has a great browser. I still have my XV6800 (HTC), but I would recommend it to anyone who is looking for a business phone on Verizon Wireless.