I havent tried it. If you want just try and see. Its only sign up right? Nothing is there to download. So no problem. If there is something to download , then be carefull. Or if they ask you to pay fees or something like that , just leave it. If they ask for some payment then it may be a scam. Mostly All these types of websites are scams.
Correct, if you are not sure that a certain site is a scam or not, try to register on that site using your dummy information just to test it legitimacy, because who knows it might be a Phising site, so if you are going to use your legit information, like for example your email that you have used in making a bitcoin wallet, then all of your information about your bitcoin wallet will be leak to them, and the worst thing that can happen is that, they are going to steal your bitcoin without being notice.
So, it is better to examine first before we try it, asking first will help, since there is no fee for asking, it is free.