That leaves two other possibilities:
You think the SIM is an overprices mediocre piece of gear, but - especially given your standing as an influential authority on SSPs - publicly stating this would not endear you to the manufacturer (who happens to be a solid advertiser in the mag), so you wisely plead the fifth.
You have not had enough exposure to the sim to form a qualified opinion about it, and therefore wisely refrain from expressing one.
You think the SIM is an overprices mediocre piece of gear, but - especially given your standing as an influential authority on SSPs - publicly stating this would not endear you to the manufacturer (who happens to be a solid advertiser in the mag), so you wisely plead the fifth.
You have not had enough exposure to the sim to form a qualified opinion about it, and therefore wisely refrain from expressing one.