Eh fishyman i got a quad 300 with the 400 assembly and i wax my string and deck every5 or 8 shots. String replace ment let see never. Why i take my bow to the archer shop and they rewrap my srtrings or inspect them so ive had my xbow for 4 yrs and never changed that. And for trigger lubbing etc little drops of gun oil thats about it. Arrows i use xx75 2219 easton arrows with 125 gr shock waves. Good luck to you. theres not to many barnett fans here but i hope you enjoy. As i like mine i put mine through hell and back and keeps on going. I like when i can go buy a package with everything and not buy everything seperate. To me thats my own opinion.