I also have several of their video's and maybe once or twice been dissapointed.....after all you cannot always hit it out of the park....but they do have good info....So it's no detriment on their part....and I have still always considered buying new instruction from them.
I did purchase this Compression video....I am only 1/3 of the way thru it.....in some of the lessons the man is very technical and I will end up rewatching this many times over. He does go over all the controls you find on any given compressor....so this is good....and he explains to a point the math behind how the controls interact with each other so it will give you an great idea of just how they work together as a unit.
On the other hand I also have their "Effects" video and it covers Compression. (Generally) But for what ever reason I actually "Heard" the effect compression had on the samples used. In the video of this topic it is harder for "Me" to hear it actually work......but at least I know what I am listening for .......it's just operator error at this point ......LOL
But I'm thinking that at least with both of these and doing some rewatching along with some other personalized Compression video's I have the light will go on for me....
But in reality, for the price of Groove 3's tutorials they are well worth the money. If you compare them to say private instrument lessons 3 hours of run time for say $34 equates to just a hair over $10 an hour......which is cheap especially since you can re run them and pick up what you missed.......
and if you compare them to university lessons for an instrument two video's would still be cheaper than one Lesson there.....
Just my thoughts.
Clifford
P.S. I find these great to put on a USB stick, take them to work and watch at lunch hour.......