As said above, it will only run at 12v, that is what it is being supplied with. It is actually similar internally to the strong and as such can take the extra heat. It's all watercooled and thus runs at very low temperatures. These pumps were built with a server environment in mind and as such, yes, it will run for a very long time. They have an MTBF of 50,000 hours which means that running 24/7 it will run for around 6 years straight. Yes, if you tried running it for 20 years straight it would probably last an extra year or two, but realistically you are not likely to run it that long and other system components are going to benefit more from the extra flow anyway.
It just bugs me to hear misinformation about the longevity of pumps etc. There is not going to be an issue for any enthusiast between the pump speeds. I should also point out that, due to the water-cooled nature of the pumps, the heat is not an issue, it is only bearing wear that would be of concern. The bearings are very durable and, as there is less difference in actual rotational speeds between levels than you would think, the difference in longevity would be minimal.