For my bike I bought the Maier panels out of Dennis Kirk. They look alright, but I did have to do a little bit of modification to get them to fit properly. The thing that bugs me the most on them is that they no longer used the little plastic tabs to clip into place, they come with screws and little pressure nuts that sqeeze into the rubber gromets from the stock set up. It's really not that bad for the electrics side since I plan to have tools anyway if need to works on the electrics, but the when it comes to checking the oil... it's just one more tool to have to carry around.
If you're just looking for somethng to replace nothing, I say go for it. If your doing a reaaly nice resto, go DSS. If you need to replace just one, check out ebay first. If you cannot find just one, replace both so that you have a mtching set.