I've just come back to car audio after a long time away.I worked for one of the premier shops on the east coast in the late 90's till 02 and learned from someone who was extremely well known in the industry at that time and we did just fine back then with a scope
We had quite a few installs make it to the nats too
I like the tools because they are simple but seriously a good scope is better for those that know how to use one unless you need the simplicity.I honestly might buy the one to eliminate having to do math and make things easier for customers to see and understand.Lets face it people want to see watts not math.But to act like it is the only way to do things is plain wrong.
My complaint is how they make it seem like its the only way and that really has kept me from spending the money on principle nut if I see a used one I might grab it.
As far as that distortion test video,that easily could have been in the recording of that cd.If he wanted to actually prove something he should have put the cd in another plater and redid the test.As it sits it is nothing more than smoke and mirror salesmanship.If you dont believe me,take your test tone cd and rip a few highspeed copies,each one off of the next with some cheap gear and run the test for yourself after a few copies of copies and it'll most likely add enough noise to the signal.