You're selling a new way of working on your computer, something supposedly greater than the sum of its parts. Such things can't be expressed in numbers and tables, they can only be experienced. That experience won't be for everybody; they might get sick, they might decide it's a worse experience and make things take longer, etc. Those are my fears.

Spending $2800 (or, gulp $3500) just to see if I'd barf while in vim is a really big stretch. Perhaps those with way more disposable income wouldn't mind trying, but that's not me. If there was a trial period with free return, that would help.