Because it's hard to know when you're going to get a flat, it's always good to have extra tubes on hand. Specialized's Thorn Resistant Tube is thicker on the road side for puncture protection and thinner on the rim side for weight savings.
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I've been commuting to work for about 15 years now and do approximately 6 miles each way in San Francisco. After a series of flats I decided to splurge and grab a set of these for my Specialized, and was thinking - Great The extra thickness will definitely decrease my chances of a flat, enough to offset the extra weight. Unfortunately, both tubes lasted less than 4 months due to the valve stem ripping while inflating. I usually fill my tires about every 3 days and am very easy while attaching the pump head and taking it off. I've had basic cheapo tubes last a year or more and was very disappointed for the amount of money they cost. Maybe I just got part of a bad batch....