I vote no, not worth it. If you want decent quality non-oem then look for platinum instead of stainless steel. I've bought 2 different sets of SS and both have quality issues and over time developed rust spots. I've seen platinum versions run about 20-30 dollars more but are a little tricky to source. You probably have better luck with gen3 than I did with gen2.I found some sill plates for M3 2014 for $30
Stainless Steel Door Sill Protectors Scuff Bumper for 2014 Mazda 3 Axela Hot | eBay
The OEM sill plates are $100+ . Is it worth buying the $30 ones ?