Just went and checked jupyter lab and for me it was amazing. Watch the video yourself at https://www.youtube.com/watch?v=dSjvK-Z3o3U or run jupyter-lab already in fastai env
Looks like there was an old post about this which was suggested to me after I started writing this Try out "Jupyter Lab" but did not get lot of views.
absolutely love jupyter lab, in case you go for dark theme, do remember to set ‘darkbackground’ for your plots
I’m loving it as well… 
The autocomplete especially, I think is much better!
The only thing I miss is Javascript output:
I’ve been using it for quite some time now and have to say I absolutely love the layout; however, it’s still lot less stable than notebook n freezes on me during training on larger datasets. Absolutely love their work and hope to see a more stable version soon!