As per iLounge's 160GB 2009 review
"One other performance statistic worth noting is the iPod classics transfer speed relative to the current iPod nano and iPod touch. We used the same 1GB test playlist of mixed audio and video files with all three of these devices, as well as older models as noted in the nanos and touchs separate reviews, and the iPod classic dusted the other models: it transfered the 1GB in 57 seconds, versus 1 minute and 29 seconds on the iPod nano and 2 minutes on the iPod touch. In other words, in our testing environment, it would take less than 30 minutes to put the same 30GB of content on the iPod classic as it would take 60 minutes to put on the current 32GB iPod touch. Its surprising that the iPod model that has the least need to swap its contents is the fastest at doing so. "
http://www.ilounge.com/index.php/reviews/entry/apple-ipod-classic-late-2008-120gb-late-2009-160GB/P2
Here's the thing. While it may be faster to transfer lots of songs to the iPod classic, what you have quoted there says nothing about the time it takes to retrieve and play a song, or lookup album artwork, in real world, everyday use of the hard drive by the onboard OS (i.e. navigating to and playing back music). And it most certainly does not account for spinup and spindown.
My complaint has never been with transfer time. I think transfer time is as fast or faster than it was on my old iPod with the glowing red buttons. Frankly, I don't really even care much about transfer time as I usually only copy one or two albums at a time after my first big migration, which I leave going overnight.
the only time I really notice a delay is, like you have pointed out, when the hard drive spins up..even then its so little I wouldn't even consider complaining about it....
Only delay the hard drive should impose for the entire system is when it spins up, even then a slight delay at most 2 seconds and once it spins up there shouldn't be anymore lag or performance issues with it...
And that's where you and I disagree. My old iPod with the red glowing buttons never made me wait, even for a nanosecond. I feel like the performance of my 2009 160GB iPod Classic is markedly worse than my old iPod. Not to the point where it is unacceptable (I still own and use the iPod as my primary music player), but to the point where I am a bit disappointed as a long-standing Apple customer.
Usually my experience with Apple products is that newer models have better performance, and this is simply not the case here. While it's true that this model has more functionality than my old black-and-white iPod which only played music, I would give it all up for something with a big hard drive that just navigates and plays music well.
The additional unresponsiveness of the click-wheel is just another issue that irks me, along with the inability to switch off the clicker on the headphones and have it just use the internal speaker.
Overall, in my opinion it is a B+ grade product, released from a company which usually does not settle for less than an A minus. I believe it could have benefited quite a bit from software that was better tailored to the needs of the device instead of what is obviously the exact same software that was written for the flash-based iPod nano.