The market in Las Vegas has fallen roughly 10% over the last couple of years. However, on the investment I am involved in - the independent valuation valued these apartments as having stayed the same value (not fallen or risen).
That was last September, and I'd be surprised if anything had changed since then. However, there is obviously truth in the fact that these apartments are not following the market trend. I assume that when the market does turn, these properties will appreciate well. Just when that will happen is anyone's guess!!
However, it also means that the property option they offer is reasonable value for its return, but personally I'd be surprised if there was much to be gained at present from taking the option, buying the apartment and selling on the open market. In 2-3 years - maybe.
Personally I'd stay out of the US market at the moment, unless you are going to buy something like a repossession at significantly below market value. I imagine the sub-prime situation offers a number of good options to do this at the moment if you are willing to make the effort.