I use a variety of devices! My iPhone, iPad, Macbook, Windows laptop, Microsoft Surface tablet, Kindle Fire... holy hell, that's a lot, lol.
I find that it's sometimes hard to navigate the site on my phone and sometimes my tablets. It's a lot easier on the laptops or on a desktop. I have heard that they're developing a mobile site and possibly an app as well though!
Different from time to time. Desktop, laptop, nexus 7, android. My favorite to use is my laptop because it works the fastest and I can type more easily on the keyboard than hitting the screen of the nexus 7 or android phone.
I tend to use my laptop. It makes it easier to open links, reply to questions, scroll down the pages etc. The only alternative I have though is my blackberry which isn't the best device for internet browsing...
Dell Optiplex desktop. I like it. Before I had a Fujitsu desktop. Before that a no brand desktop. I have used my wife's Inspiron too, with and without extra screen and keyboard. No tablets, smartphone or netbook.