The S731 is a slim, elegant knife. It weights only 75 g /2.64 oz/ (117 g /4.12 oz/ with the sheath).
The S745 is a different category, according to its specs that’s a heavy duty beast.
I use a knife about 10-20 times a day, incl. kitchen knives and folders, open packages, cutting straps, w/e.
On job I use it even more, cut rawhide, EVA foam and whatnot.
Flashlight? maybe once a month in summer and once-twice a week in winter time.
Well, I live in a developed country so there’s not so many spots where I need a light if it’s not looking for toys under the sofa or in the very rare occasions when there’s no light at the front door (happened once during the 3 years I live in this flat).
On the other hand I’ve bought tweezers with a flash light built in. Good idea to have light where you need it but sadly it’s made too cheaply.
The arms are not hardened so it will bend with nearly no force
They don’t have the “X” but they are sturdy and very good! I’ve been using them in that knife and so far it is working pretty well. Sticks well in the jeans and is really deep carry! I would recommend these if you want them!
BTW, I have one of those with the “X”, but is completely crap. Probably it is a copy of some kind of alloy. These that I’ve bought, they are metal!! Hope it helps