I bought these for days that I'm not racing as my Asterik knee braces feel bulky on easy ride days. These guards provide adequate knee protection and are very comfortable, way more comfortable than my knee braces. I would recommend them to a friend.
Great idea, but perhaps not tested. The hard shell is definately protective, but is just too bulky for most trim fitting pants. I exchanged these for the "LITE" version, and I really like them (protective, trim, comfortable).