Honestly I have both the Mark II and ZT0301, honestly the best duty knife I have (L.E.) is my CQD Mark 1 type E. Its lighter and a little bit thinner than both and for $67 so what if I jack it up (not that I have been able to) I also find the seat belt cutter extremely useful for cutting off bar bracelets and medical bracelets or anything involving a baby. Its extremely sharp and there is no way to hurt someone. Its also extremely easy to operate while wearing gloves of any kind with the button lock and the thumb stud being set out away from the handle. It also is easy to close one handed. I have used the glass breaker and it works with very little force (however it sounds like a gunshot). I would strongly urge you to consider it, out of 60 some knives this has been the most useful to me on the job.