I think I paid around $45 for it. I don't give a hoot about it's data transfer speed since I use it as a virtual ODD and it's significantly faster that any CD, DVD or USB thumb drive. I only have a 160GB drive in mine but it has dozens of ISOs on it and the drive still has plenty of space left for more.
What I don't like about any of the menu based USB software solutions is that the ones I have looked at only support certain OSes and such that can be configured in the menu. With the Zalman, any ISO of a CD or DVD that I can copy to the drive can be booted from. There's ZERO configuration required.
As an example, from the YUMI web page:
YUMI-2.0.1.8.exe – June 17, 2015 – Changelog
Update to support newer GRML 2014-11, CentOS 7, Clonezilla 2.4.2-10, and Ultimate Edition 4.
No updates needed for the Zalman.