Tange Prestige is a very thin-walled tubing (eg 0.7/0.4/0.7 top tube), which is great if you're looking for the lightest steel frame possible, but not necessarily ideal for a big guy on a big frame. A lot of manufacturers switched to thicker or larger diameter tubing on the larger frame sizes even for their high end bikes because of the flex. So you're getting a high end frame, but you may find it's a bit too lightweight for you.