Yes, strongly agree "you get what you pay for"!
There is a lot of supplier selling at such a low price, but you never hear what is their material grade. The only thing you hear is how cheap their filament is. So watch out for those supplier.

Should look for the following before buying:
1) origin of manufacture
2) material grade
3) diameter tolerance
4) roundness tolerance
5) background of manufacturer

After purchase, pay attention to the following
1) surface smoothness
2) color evenness
3) quality of spool holder
4) weight
5) vacuum sealed bag (is desiccant turned blue?)
6) check if tolerance is what it is advertised

Daniel Poon
BotFeeder Canada