I just sold a Tom Schultz Rockman that I had since 1981. It was a pretty descent little practice tool for back in the day. Was is something that I would seriously try to record from and cut an album on, no. I wish I had all of these toys available to me when I was 18, many years ago. They would have been really handy to write songs from and get basic arrangements laid out with other band members.
In all honesty, I think Amplitube for iPad sounds better than that Rockman. I guess I see them the same way, same type of tool, for the same application.
I find IK products to be pretty descent. Their T Racks plug ins are really good, Amplitube is my go to Sim and there iKlips and stage tools do a really good job for what they are intended. Am I an IK Fanbouy, not really. I just spend my money on things that work well and don't on the things I have no use for.