I tried this link, someone sent it to me while ago. They send basic strings that if you bought locally or online from major supplier in 5 or 10 packs u can save money going taht route. As for sharing your email info, all I can say is do they ever. I actually ended up giving up on that email account and opened a new one after that. That was my bad for not using the junk account info anyhow. I pretty sure most of us have a account for that. Yes they are legit, however , it is true when they say you get what you pay for.
I would much rather pay for my strings now, get what i want, and save money in the long run. If you picky about strings there is no other way.