Now days they just offer free balancing so might as well just buy the tyres and go somewhere else. Shops like Hin Leong, Oscar tyre offered a cheaper price but known for their bad workmanship. Most probably they just want to finish up fast.
First off, forgot to ask, what's your car and spec ? Comparing Primacy and Rovelo Sport, i can guarantee Primacy won't have the grip of Rovelo and Rovelo won't have the comfort of Primacy.