I always highly customize the questions and get rid of the ones that are way too obscure. Always tweaking my wording when I see too many clients misinterpreting the question.
I don't like to send them until after the new year. I like to let people enjoy their holidays without having to think about taxes.
We use Paychex's SurePayroll for Accountants. We keep the clients, the clients do 95% of the work, we get paid. Plus we can run interference if needed (add new employee, take one out, adjust state UI rate annually, etc) and pull reports quarterly.