I use a keyboard all day, 5 days a week. I've not used a mechanical keyboard in many many years, having used the standard rubber domed stuff that is the norm. Here's what I've noticed from a week of using it:
* The tactile keys. Because of the prominent edges it's easy to feel when you're touching the edge of a key, rather than the top, which helps accuracy.
* The clear feedback (feel and touch) when you press a key. No more wondering whether a key press registered because you were slightly too delicate. It's loud enough that if you shared an office it would likely be a problem but I don't share an office, so no problem.
* The LEDs for the num lock, caps lock and scroll lock are *very* bright. I solved this with a sticky label over the top. They're bright enough to show through, so no loss of functionality, it just looks a bit naff.
* It's higher off the desk than the keyboards I've used in the past. I purchased a wrist support separately so my wrists were not at an awkward angle.
* No media keys (which I knew before I bought it). I solved this by assigning some keyboard shortcuts.
All in all, not perfect, but very pleasant to use and a distinct improvement on the keyboard I had been using.