ok i am understanding some of all that! The website has the following info on the machine i have in mind:

Machine Working Area: X=1000 mm; Y=600 mm; Z= 110 mm
Enhanced power and precision through the use of 2 motors on the X-Axis. This arrangement provides for a constant tension and compression during milling operations.
Only high quality bearings and guideways used to provide smooth precision of operation (repeatability approx 0.02mm - 0.03mm).
X and Y guide ways are hardened and grinded, with double sets of bearings used along with precision trapezium thread lead screws.
Traverse speed of rapid feed max. 2000 mm/min
Resolution 0.00187 mm ( 1/8 Step)
Reference switches on all axes with software limit control.
Double safety emergency stop button
Energy chain for clean cabling
Milling Motor anchorage: Euroneck 43mm
Modular frame for universal application
Table size/clamping area: 1330 x 700 mm
Total dimensions incl. motors : LxWxH = appr. 1350x840x500mm
Machine comes complete with a 4-axis, 5-channel (2.1A per axis) microstepping driver. The drive consists of 4 qulaity Nanotec stepping motors (2X, Y, Z, A) with 1600 steps/rev (1/8 Step).
Control software WIN PCNC Light also provided.
2 Year Warranty.

Am i right in thinking that i will still need to do 2 passes even with 6mm MDF?