Yes, I use Studiotax as well.Have not. For the past few years I have used Studio Tax, which is a free download and links right in to the CRA website to submit your taxes.
No need to pay for tax software.
Do you mean that you have to use Auto-fill in conjunction with a real tax prep software like Studiotax? In that case, I might as well just go with Studiotax and avoid involving Auto-fill.I used it last year with studio tax. Very easy and simple if you do not have any complicated staff.