Good, but that was test in controlled environment not in uncertain war situation.
It is a good system but no system in this world is invincible which means it can be defeated.
Edit.
When Barack-8 will be fully operational with IN fleet??
This is supposed to be coming with Chinese subs, because all new Chinese subs are capable for firing it, and even US think its very potent and deadly system.
Quote:
Description: The YingJi-18 (YJ-18 or Eagle/Hawk-18) is a vertically-launched, long-range, supersonic, sea-skimming anti-ship missile designed by China to kill US Navy's Aegis-equipped destroyers or its equivalents provided to Japan, South Korea or European Navies. The YJ-18 is planned for deployment by the newest People's Liberation Army Navy (PLAN) Type 052D class destroyers and subsequently may be incorporated into existing destroyers and submarines as part of a modernization effort. Its guidance system consists of an advanced inertial navigation, maybe backed by the Beidou Chinese GPS, plus an active radar seeker in the terminal phase. Besides, a built-in data link allows the carrier ship to update the target's location. The Aegis-killer missile existence was first reported in 2013 with an entry into service expected by 2014 or later.
The YJ-18 missile is equipped with a 300 kg high explosive (HE) warhead capable of taking out a destroyer-sized ship. The HE warhead can be replaced by an anti-radiation/electromagnetic pulse warhead that is said can take down up to 60 percent of the enemy ship's electronic systems at a range of 50 meters after detonating. After the vertical launch the missile's turbojet engine is capable of flying at a cruise speed of Mach 0.8 for about 180 kilometers after that point the warhead section separates and a solid rocket engine ignites allowing at a top speed of Mach 2.5-3 for about 40 kilometers. The missile can maneuver at 10G acceleration to avoid enemy interception by air-to-air or surface-air missiles. The missile design and performance is very similar to Russia's 3M54E which may have been the template for the YJ-18.
Unquote:
YJ-18