I wish this would have gone more in depth in his experience with colemak and vim. I've considered switching keyboard layouts in the past, but applications with lots of keyboard shortcuts (like vim) make it seem too difficult.
Other than that, I did not configure any other vim keys.
Overall, I love colemak and couldn't imagine going back to qwerty. I've internalised it and find it natural to type with and I'm still often amazed at how much I can type with the home row and I love how common key combos just roll off the fingers (ie they use keys that are right next to each other or otherwise really really easy to type in combination).
I dunno if I'm really much faster. Probably not, but my accuracy has improved and I find it much more comfortable for long periods of typing.