Pros: Overclocks well, Easy to unlock and a large percent do, Cooling works well for air
Cons: Higher price, Lower stock, Small bios issue
On stock voltage, I have both of them OC'd to 950 core clock and 1420 memory clock, and there was some room to go higher but I opted for lower temps because the fan gets loud past 55% when you have two of them.
If you have the fortune of this card unlocking (and they usually do, from both personal experience and what I've heard from friends I convinced to buy it), you pretty much have yourself the best price/performance point on the market for gpu's.
However, they aren't completely without issue. There's an issue in sapphire's bios relating to power usage/throttling. It can be easily fixed by changing powertune to 20% in the catalyst control center. However, most people like to use Afterburner/Trixx/etc. for their fan profiles and whatnot, and some people have had conflicts giving them issues. It is certainly something to consider. In the end, I thought it was worth it, but that could be different for you.