Probably not, but paying $55-80 for something you can make for $30 is against my "religion". Also, I had all the parts I needed to make a cable in my parts drawer, which was a factor. So if you're intimidated by soldering buy a ready-made cable. Or, learn a new skill - it's easier than tying your shoes.
Trimalyzer does work for MAF tuning. I haven't messed with it since last fall so all the details are a little fuzzy, but unless you've changed sensors or modified any intake plumbing you shouldn't need to make very drastic changes to the MAF calibration.
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