Thanks for all the responses.
There were a couple of reasons I chose to feed dry sugar. It's not as big of a mess, and I don't want to have to keep track of "syrup honey". They are eating all of it, that's for sure. Since syrup is just sugar and water (and there is a ready supply of both), why would dry sugar require more processing? Speaking of water, I have set up a large ceramic saucer like you would put under potted plants, and put rocks in it so they have something to lite on. This is sitting on the ground about 12 feet from the hive. So far, I haven't seen a single bee using it, none are drowned either. Any ideas why they aren't drinking out of it? There are a couple of swimming pools pretty close by, but I'd think this would be preferable.