Remember, the cutting edge always bleeds.. I am sure this will be a success but feel as its under-developed and will be outrageously priced, and a cheap better working successor will arise within 3-4 months of launch.
Due to the recent infos about new disc layout, drive reflashing, and AP2.5 implementation - this is welcome news. The ability to basically 'keyroll' with MS firmwares and disc infos is not a good thing, and AP2.5 has serious unleashed potential. Yet MS hasn't moved forward with it. I have a feeling though this won't properly emulate everything - or we will need a working drive with original disc inserted for best compatibility, and that wifi dongle thats likely another $30 to keep its annoyance factor down. This is if MS don't shut it down within a month of release.
the key uses a USB2 interface, not USB3 interface, and its connecting to a SATA2 port on the mainboard, not SATA3, so there is your bottleneck. A HDD with a low seek time is more valuable than a high transfer rate. I don't believe you will notice that much performance difference tho in comparison to the cost. a cheapie basic WD blue would likely be more than enough.
Hopefully with this we can use it to modify disc images (for homebrew loading) and/or find overflows that will result in us being able to use freeboot on ALL xbox 360 units and enjoy the benefit of full homebrew without this dongle adapter mess.