Seriously Trace Memory is just not worth the money or bother of owning. Its totally unsatisfying as an adventure game because of its miniscule length and only mildly interesting plot. It has some of the most ingenious puzzles I've come across and makes good use of the new features, but only worth a rent.
Personally I bought it, finished it in a couple days and took it back on a "7 day no questions asked refund". If you fail to rent or do that, I suggest waiting til it makes its way into bargain buckets or 2nd hand copies on ebay etc.