First of all, look at all the pieces. I have learned the hard way to buy the stuff that looks the plainest. Why? Because it can go with everything and you can wear it for years to come. No point in buying what is “cool” this season when you can spend your money wisely and buy something that is “timeless.” Also things that have more bells and whistles tend to not last as long. I have one bracelet that was extremely cool, but after a certain piece kept falling off (the piece that kept the bracelet together) I had to exchange it for a completely different bracelet. They do stand behind their jewelry - thank goodness!!! They nicely explained to me some things aren’t meant to be worn on a day to day basis (which I wear my stuff daily to work and around the house). So when you go to buy something - ask yourself - will I wear this everyday, what type of wear and tear will it get, can this be worn to work - things like that? I would go and talk to them, tell them your budget, how it will be worn, and see what they have to recommend to you. Then go home and sleep on it 
I didn’t initially do this, but after the broken bracelet incident I now do that before investing in more jewelry. .
As someone mentioned, they will get tarnished if you don’t clean them. That seems like a duh(!) thing to me. When not in use, keep them in the pouches they provide you with and they should not get as tarnished as fast. Also buy a good silver cleaner (ask them to recommend you a brand) or take it back to the store where they will clean it for free.
So I hope that helps, and I’m sure you will end up enjoying whatever you buy. Just take the time to buy something you will enjoy for a long time and not regret in the long run.