The European cylinder lock is more requested than the old recordable double bit system lock: it is defenetly more user-friendly even if there is not such difference between the two locks as far as the performance is concerned.
The most appreciated aspect is the key dimension which is like to that of car key, so it is easy to keep in the pocket. However, this is not the most important advantage, since the real benefits is to allow masterizations to open different locks systems with the same key ( i.e: security doors, door gate, garage).
Security doors with European cylinder profile has three main features: the lock, the cylinder, the anti-drill defender which protects the cylinder.
All this components should be quality certified: in particular it is very important the type of cylinder.
Since the cylinder is the easiest part to replace, it is also the accessory where it is easy to safe money with unexpected results.
European law EN 1627 doesn't foresee all the possible attacks to cylinder.
However, the certification is valid only if the security door is sold with the same cylinder used during the resistance test of laboratory, or it is sold with a cylinder with same degree of security.