I started my wallet there in 2013 and forgot about it.  I recovered it and now updated it to their "new wallet."

I saw a lot of posts on Reddit that say it would not be wise to use them. But I like the site and the app for my iPhone.

Dumb question, if I make an address with it, can I use that address with a different wallet? If so, do I just use the address and key to migrate it?