As a serious netbook user as I am on the move a lot and CBF carrying a whole full bangs and whistles lappie everywhere, I can tell you that I am duly unimpressed.
Why hobble a device with hybrid optical internal storage like this? The prime advantage of a netbook is form factor and endurance, being frugal with energy.
As far as I know, optical drives are not frugal with energy the way SSD's are. I might consider something like a momentus with a much larger SSD cache but even then, I am not sure the benefit of having a larger internal storage capacity completely outweighs by a large margin the disadvantages of having a device with a higher power consumption, potentially slower reads, moving parts (maybe I'm still old fashioned but I have had HD heads crash, and it's not nice).
Having said that I have been considering replacing the winchesters on my 16 inch lappie (read hot bollocks-burning i7 desktop replacement) with momentii. A few mates of mine have said momentii are a pretty good compromise. I'd put *pure* SSD's in it but for the cost. If this new optical hybrid thing can match the promise of momentii and like, I might consider it for desktop replacements or larger.
IMHO: for now, get a decent SSD in your HD bay of your netbook. Enjoy the advantages over winchesters and lump the disadvantages. You just have to be a bit picky about what you put in it. External storage for big files and optical media. Just take the hit from using usb 2.0, after all, it's a netbook.