Tyler WM (http://www.tylerwm.com/) shows a lot of promise. It's a pretty good 1.0 but there are some edge cases that still prevent me from using it full time.
To chime in here, IMO what sets Tyler apart is that it takes control of a window as soon as it is created, whereas AFAIK all other offerings leave the windows alone until you use keyboard commands to resize them.
It is indeed promising, but like you I cannot recommend it to anyone until they have fixed several critical bugs.
Could you elaborate on what some of the bugs you ran into were? I came across it the other day and was eager to try it, but reticent to spend the $10 without a demo (currently in between jobs)
Oh, stuff like windows becoming unmanaged, Tyler becoming disabled until a restart, windows moving around without you wanting them to. It's pretty much an alpha product - don't spend yet, wait a couple months and see how it goes.
Last I tried (admittedly a few months back) it was still alpha-quality. I.e. the entire screen would get shuffled unpredictably, windows would end up misaligned (partly overlapping each other) etc. - nowhere near usable.
It is indeed promising, but like you I cannot recommend it to anyone until they have fixed several critical bugs.