I have a WEE NS with the 50 lumen emitter.
I was looking for a small, truly pocketable light (the RAW NS I have also fills this niche, but I thought I'd try smaller still). I currently keep the WEE clipped to my money bag and the light adds no real bulk.
I use the light when getting in the car, when I drop things at night when I'm out and about, to light the way to a bigger light, etc. The uses I put the WEE to are pretty much standard for "key chain" lights, but I don't like AAA and coin cell batteries and I wanted rechargeable batteries.
I chose the 50 lumen version as I felt 25 lumen wouldn't be sufficient in a low light enviroment, versus a no light enviroment, and I read the WEE was all fill with little throw. I further felt the 80 lumen runtime could be an issue over a week of use on one cell. BTW, I do have multiple battery cells, but changing batteries in near dark conditions on small appliances isn't something I wanted to do.
Overall, I'm satisfied with my choice. If I were to use the light for reading or walking about the house in total darkness, I can see ordering a 25 lumen emitter. The 80 lumen emitter's function is taken by my RAW NS and MicroExtreme (a CR2 light) - one of which I have close-by when away from home.