I have been using a Gigabyte Extreme X58 paired with a core i7 965 for 4-5 months now.
As for overclocking, couldn't be easier, and nice and stable with so little Vcore. I like the design and colours used, as blue being my favourite colour and matching my blue LED's of my antec 900.
Pros:
One of the best, free NB water block, high performing, easy to overclock.
Cons:
Price is high, but considering it is one of the best, takes a while to boot (turn on, off, on then POSTs)
Overall I would give it a 9/10 and am very happy with the purchase.