Slow SSD/fast SSD in laptops

So I was reading some reviews, and some laptops seem to have slower disks than others. For example, 500 i/o vs. 200 i/o. Under what circumstances would the difference be felt? And those numbers, I meant literally 500 vs. 200mb/s, weren't just examples.

 

Those are sequential numbers. They matter most in file transfers (provided the other storage medium isn't a bottleneck) and game loading.
The number to u gotta look out for is 4k random read at queue depth of 1. This determine how responsive windows is.
Windows 7 boot times is also determined by the random 4k read number so the faster the better.
Windows 8 is a bit different due to its fast boot, this is basically a solid read from a compressed file so the boot time is partially determined by the sequential speed. I. E. I a 500mb/s ssd will boot windows 8 faster but it will only boot windows 7 faster if it has faster 4k random read.

 

I'm all for Windows 8. So assuming that 8 boots in around 30s, it'd boot up in ~15s in the 200mb/s one. I wonder how fast is Yoga 13...

What about other software? Word, Excel, Web browsing, etc.?

 

On the plextor m5s vs the Intel 320. It's 500mb/s vs 250mb/s sequential but both random 4k speeds were similar at 25mb/s. Windows 7 boots the same at 25 seconds but with windows 8, the plextor drive boots the machine in 17seconds while the Intel 320 boots it in 22 seconds

 

Perhaps isn't directly relevant then. I think I should just buy Yoga 13 and be done with all the choosing around.