Get them, you will not be disappointed
I don't often write reviews, but when I do you can be certain it was well worth my time.
The latex tube (irregardless of Mfr.) is one of the most under-appreciated additions any serious roadie could consider for their ride.
I mounted my race tires in March of this year with these exact tubes and a set of Continental Attack/Force tires for my CAAD9 race rig. Throughout an entire race season of 30+ races ranging from crits, to full on road courses, these tubes have performed flawlessly. They lose 10-15psi of air over the course of any given day, but if you are a dedicated cyclist, you should be checking your tire pressures daily anyway.
I have hit multiple potholes, rocks and debris that should have flatted me on the spot with not one incident. Where I watched fellow racers and friends flat on courses, I kept racing and finishing strong. Since my initial purchase earlier this year, I have bought two spares to keep in my seat bag and replaced only the rear Force tire from finally showing cord in the tread. I re-used the same tube and it is still running strong. They weigh 75 grams each which is inconsequential in the grand scheme of rolling resistance.
For the time that these tubes have lasted, I would have bought multiple butyl rubber tubes and spent the same amount of money, if not more. They pay for themselves over the course of a season.