I'd go with science.bio and get the powder and buy some caps and a scale on Amazon. Size 00 caps weigh about 100mg empty.

They're reputable. Not sure about the site you posted.

It converts to fl-modafinil in vivo, which is twice as potent as modafinil. It's like a mack truck. It's subtle, but you keep going. I can't use it every day though. It's about 10x more expensive than it use to be, I need 300mg to get going, and like anything, it works better of you use it when really needed.