To one who wants to buy !!!! I also took a chance and ordered the Geeetech Prusa i3 Pro B, from Geeetech Germany, on 5th of May, Building it is a very similar to you all, as I spent few weeks-ends. Some poeple seems to say that it finaly works. Yes - please have a look at Geeetech forum, where the extruder issues represents more than 50% of the problems, I did not have the chance to see it workby DanIon - Prusa i3 and variants