Everyone is entitled to buy parts from what ever source they deem necessary.
I have seen arguments/statements about different suppliers for parts on GTOUK.
GTOUK has a sponsor/trader with Evil Empire Performance, this is a trader who specialises in OEM parts, which means they are more than likely to cost much more as these parts become obsolete and harder to obtain.
We have members who find and recommend after market parts.
Both the above are a necessity to keep are cars on the road.
When recommending, whether it be OEM or Aftermarket lets keep the replies civil. I know for me where I can buy OEM I would, but it would be down to cost. I also have bought aftermarket through recommendations from members and had no issues.
Thank you.
Steve