I had to use eTax (managed funds and some sole trader items).
It's within the realm of my non-financially-savvy self to use but it's a bit clunky. Some of the population with last year's figures threw up errors that took a fair bit of time to sort through. There was at least one section that was not scrolled through but appeared in the left-hand navigation frame.
I understand why the ATO would be keen to offer MyTax exclusively because apparently it's a webapp (correct me if I'm wrong here) which will make compatibility issues a lot less troublesome. Once upon a time getting eTax working when I was running a Linux box was a little bit of a hassle as I had to set up an emulator, and the only other personal computer I had access to was a Mac, and eTax for Mac wasn't a thing yet.
Problem is, my internet connection is a little unreliable and I like being able to use a program offline...
(I also nearly got a $10k refund. Heh. Turns out I had way too much tax witheld (plus quite a few deductions). Whenever I got any penalty rates, it would push my pay for that fortnight period up into the next tax bracket, and I would also get more witheld for compulsory HECS payments. I don't think it's worth putting in a PAYG variation though because penalties are so incredibly lumpy and sporadic it's too hard to predict.)