I was only pointing out that ssd's are already pretty fast. Of course it's down to perception but I have both an hdd and ssd based system, one barely feels faster than the other and the ssd is supposed to be something like 20x faster than an hdd? If the nvme is only roughly 3x faster than an ssd real world 'feel' is liable to be nonexistent.
Here's a nice review TH did and the real world performance is interesting. In power point, almost no difference, excel no difference, word no difference, adobe illustrator no difference, indesign less than 2 seconds (I believe is the unit of measure) difference, photoshop heavy workload was 10s difference which equated to less than 3% faster (10s spread over 6min), 3% difference in photoshop light workload, bf3 no difference, world of warcraft no difference.
http://www.tomshardware.com/reviews/samsung-sm951-nvme-versus-ahci-sata,4137.html#p13
Best case scenario of real world applications, 3% speed improvement for twice the price. I agree it's important to know the details before making a decision. If someone hardly uses photoshop then there went the performance difference almost entirely. Percentages of service time are only when a drive is active which in the overall scheme of things is only a fraction of the time spent using the pc. It ends up being 3% of 20% which only further emphasizes the thin performance improvements.
Most drive activity for the typical user is short burst activity rather than sustained data transfer. The reason my pc running an hdd isn't so 'dog slow' compared to an ssd system, both drives are idling more times than not (which is typical) and a bicycle and a ferrari both sit at a red light just as fast. For someone constantly moving large files or large amounts of data from drive to drive the benefits would much much more noticeable. Then there's the issue of when transferring data are both drives as fast? If not it won't matter. Data won't transfer from a thumb drive or dvd drive any faster because those drives are the bottleneck.