How useful is Thunderbolt? Does the extra speed come in handy often?
Thunderbolt is relatively new and certainly new to the PC realm, it makes cable management very clean and in particular it's bandwidth to external
devices. So if you haven't had or plan to have many NEW external
devices then the technology won't add much if any usefulness. IF you plan on purchasing a new Monitor and/or external array then it's a good option.
Thunderbolt is a good idea however the costs for both the cabling (especially video) and device interface need to come down to make it viable vs faddish. I've noticed some of the display cables coming down in price which is a good sign.