Is it worth spending the money on better stuff

[Beetus]

I have a mate that thinks its a waste of money spending the extra dosh to get the good stuff rather than the cheap stuff that will do the job. eg

lukey- diphillipo
ss inductions- home made budjet stuff
kings springs- chopping normal ones
performance shop- ebay
megavox- alpine

Is it worth spending the extra money. will you get extra power and quality?