Game Recommendations and Some Other Questions

Hey guys! I finally bit the bullet and got a used HTC Vive on Ebay. I heard that the Vive is now lighter than the Rift but I couldn't find any info on when this change was made or if it was gradual over time. Does anyone know?

Second, as much as I love spending money, I would love to hear some recomendations for free games/demos that are worth while. Beyond that what are some paid games/apps that you would recommend over all others. I heard a lot about Virtual Desktop for example, but bigscreen is free (despite being in beta) and I wasn't sure if it was worth the money (for my first VR purchase over other games). Futhermore, I'm looking for paid games/apps that have more replayabliity than say a tech demo.

I would love to hear all of your thoughts, and I'm excited to finally join the community!