I actually just got one of these in the mail a couple days ago. Yet to try it out, but glad to hear the solid reports. For others interested you can purchase the hyena hobbed bar here: http://shop.arcol.hu/
In addition to the hyena hobbed bar Laszlo also has an indiegogo campaign running for a variety of mini-hyena drive gears. Check it out here: http://www.indiegogo.com/mini-hyena
Lastly, he is also the creator of the well known arcol.hu hotend. I've not used it, but version 4 was recently released and has been getting good reports.
If you are US based and would rather not deal with international purchases have a look at the LulzBot Budaschnozzle hotend. It is based on the previous arcol.hu design and is also a very nice.