The quality can varies a lot, so I suggest checking for number of favorites & visits to see the best scanned worlds or to go by author once you find the good ones. :)
In general, 3D gaussian splatting is not the only way you can use to reproduce a real world location in VR - you can also just do it manually, modeling the structure & possibly using textures from photos. A good example of such manual reconstruction is Gion Street from Fins:
https://vrclist.com/world/859459
As for trying it out - all of the VRchat worlds can be explored in flat screen mode on a PC & VRChat can be installed from Steam or from their website. VRChat is also free, so the only thing needed is to register & it is possible to just use a Steam account as well.
Then just get one of the URLs & there is a launch URL. Alternatively you can search the worlds by name from the VRChat UI. :)
What communities do this? Can I do this on my laptop too to trial it?