i have the fastback, fastback 2, and both of the fastback knives w/o the spring assist.. they are all amazing.. the utility knives are the only ones that i carried everyday that never showed the slightest signs of anything coming loose or just falling apart.. ive tired husky and kobalt - the huskys screws come out, and one of the kobalt models almost filleted my hand.. i have kliens, gerbers, and quite a few others.. the milwaukee fastbacks are so much better.. ive turned a few people onto these, and they carry them everyday..