It is always nice to know how many residents are using new beta software. It gives one a sense of how well people like something, assuming they continue using it is a sign of preference and satisfaction. For Snowglobe they have published some of that information. Snowglobe Meterics show about 3,500 Second Life residents using the viewer as of 6m/29d/09.
Torley has a video showing the new map zoom features. In the same blog post as the video they talk about under the hood changes. Snowglobe Features There are new texture download methods in this viewer. They say one won’t likely see much performance improvement for those changes just yet as they are only used in the maps. However, the maps do update much faster so there is promise.