Good thing only on this buff is for Farming.

-8CON can be good only if you got good armor, full epics, high evasion and max enchant skills on your passive. With this stats maybe you got a chance to win against any player.
Well for me sacrificing -CON is not bad, it can be possible but in my opinion they got no chance against +STR daggers with +CON or +DEX and +CON daggers.

Always remember dagger class are skill-dependent class, not a class just hit with normal hits.

.

Crit chance + SA: Crit dmg + Buff + attack speed from dex = pwn

if u attack faster, u have chance for more crits =)

Enjoy

And they say that the DEX and STR description is very old now and NOT updated as we must see in FREYA version.

We can't really be sure now if the description of STATISTICS like we see in other website (STR,DEX,INT,WIT,MEN and CON) if they are accurate as it say on this new version of Lineage.

Due to experience of other players STR now is giving more effects on daggers than having a DEX.

STR also gives a possibility to doubles your crit damage. No re-use time for skills (means you can do your deadly skills without Cool Down).

STR vs DEX Daggers on other forums:
http://forum.pmfun.com/viewtopic.php?f=11&t=28653&start=15
read from top to bottom.

Masters excellence in skills. Low possibility of being able to reuse skills without delay or doubles the duration. Influenced by STR.

With this passive skills this brings the game in different twist and needs to discover by experience. STR now is giving a big factor on almost fighter class.

Know what right PvP buffs for daggers and what buff must NOT have (PvP Buff tips are in clan access forum)