I have spent some time using SpeedLight, and joined their Patreon on the gold level to have full access and support the project. It certainly has a lot of potential. I use it already to be able to chat with people in SL while I'm working and I don't want to have the full client open. I love the ability to see and manage my inventory (though it needs more sorting/filtering options and more functionality), and even to be able to see and talk in local chat where I'm logged in (it would be nice if I could not be in SL to be able to pull SpeedLight up in a browser on my ipad or computer and still be able to talk to people at a location). It's not a full viewer right now, but I don't really need that. I just want to be able to connect with people in SL without always having to use the full client, and it works beautifully for that. I look forward to seeing it develop more.