The Panasonic ST60 is a very good plasma TV. It doesn't get very bright, but it does a very good job at reducing reflections, as shown in our pictures. Of course, it has the downsides of all plasma TVs, like being heavy and creating slight buzzing noise (read more about plasma here). If you can live with that and do not have a very bright living room, it is a no-brainer; its contrast ratio is astonishing.
Due to its powerful anti glare filter, there is very little reflection. The ST60 cannot get very bright, though, so if you have more than one window, the picture will appear a bit dull. If you have a lot of windows and still want a plasma, the Samsung F8500 is a better choice, because it can get twice as bright and also has an anti glare filter.
The input lag is higher than the S60's, but most gamers will not notice it.