My pet h8 as a laptop owner (which is a bit irrational really) is all these things people want u to plug into it, or have hanging off it.
Personally I`d prefer to replace my dvd/cdrw with a dvdrw than go down this road, but I can understand that with manuf costs being a tad higher than the norm and peoples reluctance to open things on their laptops, that a thing like this will go down great in the add-on section.
Would still annoy me to have 2 optical devices on my laptop when 1 would suffice.
Under £100 tho.. I can see it selling. Bit of a rip when u consider u can buy a full size internal one for less than £20, but still they`ll throw the miniturization tag at it. Power ? meh.