Not too much. You will get a 20% bonus on reward points.
Here is a link that explains the different levels and benefits
Silver does offer a few perks, but you'll see considerably more if you can reach Gold.
turk0322 - Welcome to Marriott "Insiders" - I've been Marriott traveler for many years, occasionally stayed at Holiday Inn, Hampton, Hyatt, and a few others, but then began to focus on Marriott when possible. It's paid off for me. Then, I found the Marriott Reward "Signature" Visa Credit Card, which has provided added incentives for not only Marriott property stays, but also point awards for other purchases. In addition to the other perks, at each annual renewal you'll be awarded a free night at 1-5 category hotel. We're going to Charleston, SC on beach trip next month, and I've booked Friday night stay at Residence Inn nearby to utilize my free night. It's not always easy to find a 1-5 category hotel, depending on the location, but this is another benefit of using this card.
* Having set up "alerts" on my card profile, I received notice of an international charge this month of which I was not aware. I looked up the company in the UK on the internet. I called Chase (Visa underwriter) and they checked the site and advised it was bogus, so they immediately cancelled my card, credited my account and sent me a new card the next day! Recommend you consider setting up similar "alerts" for protection on not only this, but all your credit cards.