I really enjoyed Signs! My ASL (American Sign Language) is limited to the alphabet and a few words, but even if you knew no signs at all, the hosts are very helpful and hearing folk so they can speak with you and explain everything and handle the transition from them to your server, who is Deaf.
I say bring your patience and your willingness to learn. I went with a friend who knows a lot more sign than I do, but our server Julian was great and made sure his signs were very clear and was really patient with me too so don't worry if you're just learning for the first time. They have a little flip book with common signs to help you and at the very beginning your server teaches you how to sign yes, no, etc.
The food was SO GOOD! Seriously delicious, so you're not just going for the experience (though I imagine that is factored into the price).
Overall I had a fantastic time and would recommend that everyone check this place out at least once!