What is your evaluation of the proposal and its APIs/implementation?
+ 
Is the problem being addressed relevant for the wider Swift on Server ecosystem?
Yes, it's one of the pillars to make swift on the server awesome and ubiquitous.
Does this proposal fit well with the feel and direction of the Swift Server ecosystem?
Fits very well into the overall direction of world domination (i.e. Swift "everywhere") 
If you have used other libraries in Swift or other languages, how do you feel that this proposal compares to those?
I don't have experience on the previous takes of lambda libs for swift.
I do have looked into the library though from a perspective of integrating with the ongoing Tracing GSoC and we'll be able to marry the two very well in the future 
How much effort did you put into your review? A glance, a quick reading, or an in-depth study?
I have poked around with the library a little bit and reviewed bits and pieces of it over time.
I have sadly not had a chance to try it out "for real"