I paid a decent amount for Tannus Armous inserts (over $100 total for 2 tires if I recall to be installed by LBS) and have been very pleased with them. They add some weight and definitely add rolling resistance which chews up a bit of battery but have given peace of mind. Since my bike doesn't have front shocks, they also had a bit of dampening effect which was nice. Would I buy them again? Yes, probably for the peace of mind alone. Knock on wood: Ill probably get a flat on my ride home from work today, lol