I find the performance of Seagate Barracuda IV and V drives to be excellent, and nobody should be complaining. So what if they are not the absolute fastest. Their performance is right up there with the fastest, and you will not notice a performance difference in real life usage. Seagate drives are ultra-reliable and the Barracuda IV and V are ultra-quiet.
All Seagate drives made in the past 10 years, and probably longer, have had a track record of being the most reliable in their class. They are also among the fastest, so don't be fooled by benchmarks that say they are slower, when if you actually think about it they are less than 1 percent slower.
If drive A can transfer a 5 gb file in 3.5 seconds, and drive B does it in 3.6 seconds, are you going to notice anything? NO.