First of all, let us compare the S1-FA 'Frenzy' stats with both the Ntec and FAR. NTEC stats:
Time to Kill 0.70 sec
Shots to Kill 6
Health Damage 190
Stamina Damage 20
Hard Damage 19.00
Drop off Range 50m FAR stats:
Time to Kill 0.70 sec
Shots to Kill 6
Time to Stun 6.86 sec
Shots to Stun 50
Health Damage 175
Stamina Damage 20
Hard Damage 19.3
Drop off Range 50 m S1-FA 'Frenzy' stats:
Time to Kill 0.69 sec
Shots to Kill 7
Time to Stun 5.64 sec
Shots to Stun 50
Health Damage 143
Stamina Damage 20
Hard Damage 14.3
Drop off Range 50 m
----------------------------------------------------------------------------------------------- Conclusion: As you can see, the S1-FA 'Frenzy' clearly does NOT FIT in its category, it requires 7 STK, which is extremely unreliable, it may be the same TTK at very close range, however at medium range, trying to land that last hit is quite difficult and often frustrating, if you are in a fire fight, you mostly just end up dying anyway. the S1-FA Brothers are quite competitive and well in their place inside their category, while the Frenzy is clearly outmatched in 90% of the situations compared to his brothers, since LO is working so hard in the balance department , I highly suggest you consider a buff to this gun.