Seems better than the current forms to me. For people in the simple situations I'll probably just tell them how to fill out steps 1, 3, 5, and possibly check the box in step 2. For people in more complex situations, especially if they don't like their overly large refund or balance due, I'll have to get a feel for it but I'd say it'll only take about 10 minutes of billable time to fill it out after I've completed their prior year return.
It would be nice if the W-4s could be even simpler, but I'm not sure how much better they can do without completely overhauling the tax law. So long as we still have graduated tax rates it's not going to be easy to calculate withholding when the filer(s) have multiple jobs.