£14.99 with the 50% discount and VAT removal (being a company purchase) for 3 computers over 2 years - it works out at a few pence per month. So not free, but so close as to make no real difference. Yes others are completely free, but from experience they also consume more system resources and are a PITA to remove.
Here we have a developer who cares about the Mac, who puts real effort into getting a quality program out, and yes, who asks to be paid for his work. Seems fair to me.
Not that I'm a fan of subscriptions, but in this case it's almost a no-brainer. The only other two subs I maintain are for JetBrains products and Office 365. In each case for me, the constant updates and improvements, and decent licensing terms have been enough to persuade me to opt in.
The UI could do with a little more polish, it's true. Those drive icons are a little too big and don't fit in well with the look and feel of a modern Mac, but to be honest, I don't spend my life inside the GUI of my AV software, so I don't really care too much about that.
One thing to note: the scanning speeds, and the ramp up time before a scan actually begins are both hugely improved over v2. A very welcome improvement indeed.