in the begining wenn i had little experians in buying and using gear, i bought cheapo stuff like a immitation SAK, nothing on it actually worked, the saw was very effective to use to sratch those itching place were you hand just can't reach, with other word it was a wordless piece of crap, same goes for a cheap multitool, flashlights, etc.
Nowdays i make sure that what i get is GOOD qualtity stuff, which i can inspect before buying. Reading load of reviews and take mine time wenn i had to chouse, stopped most low qualtity stuff. Which is very importent to me, since mine budget is very LOW.