Progisp for flashing?

Has anyone tried the software for flashing to ATNY chips?

It’s at around 5:40 in this video I came across and looks pretty straight forwards. Has anyone used it successfully? I’m just starting to learn about software flashing and other methods so far seem to have many more steps with ensuring you have the correct drivers and whatnot,

I use it and its great and easy just like in the video,never had a problem