IMHO. Been to this shop to fix alternator. They asked me to leave the alternator there so they can 'slowly fix it', but I refuse as mine is original toyota/denso.

Waited there (~30minutes) as I didn't want anything done/taken without consent. Watched them fix it. Makes me wonder why they ask me to leave it there and come back after a few hours....

The price of their Panasonic car batteries are slightly higher (maybe RM30-50 higher than a spare part shop) and you can't take back your old battery (you can sell your old battery for some money).

Their testing of alternator is only limited to voltage (no current check). Overall, they can perform the job.