i tune my bow atleast once a year. i just bought a new bow last year actually. the rages are good. ive had pass troughs on 4 out of 6 deer i shot with them... i did however shoot a buck with one last year and it went right through him but when i picked the arrow up both blades were gone. then i shoulder a deer and the penetration was very poor so i decided i was done with them. as for fixed blades i shot the montec g5s and muzzys but they fish tailed bad. i know i could set my bow up for them but i still dont think ill be very confident with my arrow being tipped with one when i have a shot at a buck of a life time... every mechanical i have ever shot flew just like my field tip and i liked that. penetration is always a worry for me tho because i always hug the shoulder blade on the deer. ive only shouldered two deer in my life tho.