I have no experience with the Silver Sonics but I'm fairly certain a number of members do. I do however, have the Sonic Seam chest high version. They're very comfortable and seem durable enough, but they are not my primary wader. I use them in the warmer temps and as a backup. They pack down incredibly small making them ideal for travel. Orvis wader repair and CS has been very good in my experience.
This is worth a read, but as with any opinion and in particular these Shootouts, take it with a grain of salt.
2013 Wader Shootout - Yellowstone Angler