Several points:

AMW (Alan and Mark Williams) are the original authors of the AMW/AGPS products ......industry calls it OEM relationships.........but evidently something has changed but the authors are still in place.

They are the original creators of vertical curve design which the industry has copied......and have been doing it long before the industry noticed.  I think they got an AE50 award which probably perked up the industry to that approach?

Initially perhaps not "easy" until you get trained on proper use then it is powerful and accurate which is most important considering "one and done" is a good thing.

Support in any venue always comes down to a good dealer verses a bad dealer so buy from a good dealer.

I started using the stuff because initially everyone was doing laser approaches under the GPS environment and I needed something more robust to take advantage of GPS.

The machine control engine is the same engine for all their products (i.e. ditch, pipe, dirt things) and thus keep in mind pipe in the ground is more of a one time shot than say a ditch.  So that being said......I have used their ditch program to cut a dirt blower meandering drain and the most slope I could get out of this one job was a .02% slope (about a .25 inch drop per 100 foot of linear travel.)  I almost had to drive a stake in the ground to watch the water move.  The point is when it dried up there were no wet spots in that "flat drain".

So an "easy" interface is not the end all consideration.  I have not used their design software for an actual project yet but have seen how dynamic it is when you play "what if" with the pipe locations......so that is all I can comment on that.

Good luck in your decision.

Arnie