The gen2 system is more robust. The problem with gen1 was when changing tires the inner carcass was easily nicked with the tire spoons and would expose the wire then that would rub against the inner tube creating a flat. You still have to be very careful when changing tires. Once you get used to changing tire on the tubliss it becomes very easy. They have a video on the website, if you pay attention and learn what to look for while changing a tire the system will last you for years.