I've got one very similar to the one in the eBay ad. It is indeed lightweight--in other words, flexible, that's how it acccomodates various rear hub widths. It is sufficient for trueing up a wheel but is worthless for centering the wheel (setting dish). If you remove the wheel and flip it over, it may or may not flex back to its original position. It's just too flexible to have a repeatable position for centering.

But mine did come with three decent spoke wrenches. Woo hoo.

My advice--save your money and use your bike frame as your centering stand. If you intend on building a bunch of wheels, get a better stand.