So it seems the rumours were true in this case: EVVA introduced the successor to the 3KS+ (and the 3ks obviously
), shockingly named 4KS .The basic concept stayed the same. 3ks meant 3 Kurven System =3 curve system, and now adding a 4th track: 4 Kurven System.
Here's what changes I gathered:
The 4th track is a "hidden" (it's quite easy to spot once you know what to look for...) and in the one I saw there is only 1 slider checking it. The number of sliders stayed the same (12-12 per side).
The key seems to be a bit thicker, less pointy, with more rounded off, thicker ends (the keyhead's design was also updated to fit into the current line).
They only seem to make the modular version which includes the anti-snap hard metal bridge. Old 3ks+ had optional modular build.
It seems to me that they may come with higher standard drill resistance, though I have to admit I'm still confused at times, there are many options and different offers in different markets.
There is definitely a heavily reinforced version now. You can opt for the SKG3 star level, which I believe is a meaningful and serious recommendation. (Though this was introduced in later 3ks+ models as well.)
So to sum it up it's not a big change. They made the modification to stay ahead of the curve in patent protection (4ks keys are protected by patent until 2035, 3ks+ "only" until 2025).
My opinion is that the lock was very good before and it's still very good. If you get the SKG3*(/BSI) version, than it's a big step forward in the physical resistance area.
Picking-wise: I see no change, it doesn't matter which track or how many tracks raise the sliders. IMO they are pretty much unpickable in real life circumstances, apart from special "CIA" stuff and so on.
I've seen 2 guys pick one with fiber glass lighting and etc., but they literally practised several days (if not weeks) just on that particular lock and would have to pretty much start from 0 picking an unknown lock they don't already know inside out. I think that they are light-years harder than most locks and noone will ever pick them on a door even in high risk environment.
Here's the official site:
http://www.evva.at/products/mechanical-locking-systems/4ks-locking-system/4ks/en/
If you know more or disagree don't hesitate to post
And gentlemen the race begins to add one to your respective collections
