weak or strong

Maybe you should try reading the reviews with it? Or checking the vroom dots next to the product name. Seems most people say it's pretty powerful for a bullet.

To follow up with what Paprika's already said, it's heavily contingent on what you consider to be 'weak' or 'strong'. Are you especially sensitive to vibration? If so, this toy is probably going to blow you out of the water. If you own, say, a Hitachi Wand (notorious for being powerful) and are accustomed to that kind of strength, this may be right up your alley, especially so for a bullet.

If you are new to sex toys, I would suggest starting with something a little cheaper/weaker and deciding from there if you need an upgrade or not.

it's pretty good

It looks to be on the stronger side, as bullets go.