First thing, most home users will not spend $200, or even near it to protect their $300 laptop ;) Trust me, I keep telling people to get backup as they lose hard drives with their pictures that cant be recovered and they still say no, it's not worth it.
I love these little 2 drive setups though! I wish they could get them to include maybe 2 1tb drives (RED or NAS drives not cheap crap) and have them around the $200 mark. I know I am dreaming but it would be a lot easier sell for people who think a single external hard drive is just awesome protection (do schools not teach anything about computers anymore and just focus on programming and using?) when they buy cheap crap laptops and desktops because they can't afford anything else, even though they have multiple houses in multiple states (sigh).
Oh well, as prices for the drives drop maybe someone will be able to start getting closer o the price point that people may pay.