Early USB3 items(not leaving out funky BIOSes and drivers from hell), esp cheap ebay stuff, was like a game of russian roulette, overall it seems to be way way better now...Personally I'm avoiding anything USB 3.0. I've had major issues with USB3 across systems. I went through a lot of HDD docks, hubs and nothing was ever very stable. Random BSoDs, aborted file transfers, etc.
If I remember correct(correct me if I'm wrong), max supported isos in the _iso folder is 32 if the firmware is old and 64 if you update it... Lots of jog flipping...I like the idea, so I ordered one of the USB3 versions. I'm hoping to replace a rather large stack of install disks.
Very nice features!If you want a more portable solution, checkout my Easy2Boot USB Flash drive project here which can boot most ISOs (linux, Windows Install, PE, AV, etc.)
It will boot 99% of the ISOs that the Zalman can boot, but has the advantage that you can add unattend.xml files or drivers folders etc. and can install from an XP ISO to an AHCI computer without needing to modify the XP ISO at all.
Easy2Boot was also designed to work from a Zalman so that you can either boot from the Zalman as a virtual CD and pick an ISO using the jog wheel or as a USB HDD and run Easy2Boot and pick an ISO from the Easy2Boot grub4dos menu.
Windows 7 will take a bit longer to install if dual mode is activated, not sure about Windows 8 and Server 2012r2.For drivers, the Zalmen works well. You can initilize the device in "dual mode" which makes it look as 2 seperate drives, an ODD and an HDD. Boot the ISO, browse to the Drivers foldier.