Whoa! Whoa! No no! I dropped $500 on XSI Foundation about a week before they d/c'ed that particular license.
Okay I'm under selling xsi
it's a billion times better than hex because:
A.) Doesn't crash when I look at it funny.
B.) Does EXACTLY what I tell it to. And nothing more.
C.) Gives me percise control over virtually every aspect of creation. Do you like bevel? How much would you like to bevel? How far would you like to bevel? Would you like to bevel a bunch of times? Would you like to bevel and then tell the beveled lines to take on a hard edge? Would you like to bevel on a Tuesday? Would your love life be better if it was beveled? And so on. That's just the bevel command. Everything single tool is like this. I can split an edge and tell it exactly where I want further edges to be split.
D.) The most insane undo function I have ever seen. This alone will ensure I never go back to hex. Unless you specifically tell XSI to forget, it will remember every single operation you perform in a given scene. Let me give you an example:
You create a cube.
You subdivide the cube once along each axis.
Delete half the cube, clone it, and symmetrize it.
You grab a face and move it around a couple of times.
You extrude a couple times off the face.
You move the face around a couple more times.
You do another 6 hours of work.
At this 6 hour mark you can go back, open up the history folder. Go back to "Create Cube" and delete it, or modify the number of subdivisions (although this is likely to make your end product go insane). Or you can go back to the original move command, the one that now has a huge articulated arm coming out of it? And remove or modify that single move function. If using a tool brought up a dialogue box you can resummon that box and fiddle with modifiers at will, as if you were first using it. I don't know if that's properly conveying how powerful and totally awesome the history log is.
E.) Documentation that doesn't suck. I can open up "Help" and actually expect to find an answer to my question. If I don't know what an option means I can run a search for it and pull up a relevant description, typically with pictures, examples and a brief technical explanation. This is such a change form Hex's "The extrude options allows you to extrude." help files. I love XSI's help files, i wish other companies cared enough to make help files as thorough and useful as they do.
Honestly i think I should probably learn Blender at some point. I've seen people put out some very nice results out of it. I just hear that the learning curve is more like a learning TRIAL OF TEARS AND FIRE.
Hm... Truespace, looks pretty cool