It's light, fast, and smooth.
Great way to get OSR heads to 5e, or get 5e heads to give the OSR a chance!
Have run it with 8 different groups, with players aged from 8 to 71, and all of them loved it.
Have only used it for one-shots so far, but we are going to try it with campaign play soon, and I'll report back on how that goes :)
[5 of 5 Stars!]