I agree -- Kino and Criterion are always excellent as well as some Janus Film DVD releases I found at the old Tower Records years ago.
As I've mentioned several times before, when buying silent films it's especially important to get DVDs from a reputable seller. With more and more of these films passing into the public domain every year, what you're really buying is the film restoration, the musical accompaniment, and the extra features, since anyone with recording equipment can now make and sell copies of these public domain titles. I recently saw a DVD of Lon Chaney's Hunchback of Notre Dame
-- the film quality was abysmal and the score was just random music, with no connection to what was happening on screen. It was painful to watch.