It's basically two grinders in one - vertical and horizontal. I have it and love it, to tell the truth. It was a bit pricier then from KMG and Bader, but I use it for knives, handles and sayas, so it wasn't difficult for me to justify the purchase.
Travis keeps coming with modifications and new attachments. Latest is a surface grinding attachment. I don't think I will be buying it, but it looks very impressive.
M