Bullseye, I would agree completely that Max is a better application for arch viz which is what I guess I didn't clearly express in my first post. I also agree that Max's integration of mental ray is much easier to use, XSI's is more powerful, but not as easy. I think XSI's features are to complex for most people, Max is easier to get a handle on. 3rd party renderers, since XSI rewrote and distributed their API most 3rd party render engine publishers have or are working on it, Maxwell is already out, Vray is beta testing.......RenderMan compliant Delight yada yada All that happended as soon as XSI published their API.
The versions you are talking about are part of the era 'The relative demise of SoftImage' they released a program based on new core technology without all the features that SoftImage 3D had or that most software packages had and recommended that you keep your copy of their old application installed and work in it as far as you can. Hey, I bombasted Caligari for doing that with trueSpace in my review, that is just bad business in my opinion, so I imagine people using earlier versions were frustrated to no end.
Price, hmmmm back then yes, but for the last 5 years or so Max is the most expensive program for feature sets by a country mile. Everyone else drastically reduced their prices years ago, everyone but Autodesk that is. Part of their strength, being so big they call their own shots. Pound for pound no commercial program can touch XSI Foundation, doesn't mean foundation is good for architectural visualization.
I realized most 3D apps have problems with CAD models back in the 90s so I invested on Nugraf/Polytrans, so I have no real problem bringing in most files into XSI or the other programs that it is integrated with on my systems. However you might want to look at CrossTalk built into XSI now and the Gator feature is Uber Cool outside of arch viz.
Batch rendering yes, you have a point their, I haven't dealt with having to render any big animations over my system in XSI, not sure about it, the do offer breaks on special addition render license, I just haven't rund into that and I have Essentials not advance, so you obviously paid the big bucks back in the day where it was what $16,995.00? I would expect it to make breakfast and coffee and pull my chair out every morning for that price.
That was actual great you originally started using XSI back when it was new and switched to Max and are very happy. For architectural work I am not surprised at all. Another thing that hurts XSI is that for the most part they are snobs who work in the game or motion picture industry and barely tolerate newbie questions. Quite a cliche that doesn't seem to like outsiders and then wonders why nobody wants to play with them. That hurts them in getting new members for sure also. The thing is that XSI is intended for the studio and the studio employee and not for the sole user. Its strengths aren't tested or that useful for arch vis. It integrates into most pipelines, companies that use Max or Maya also have seats of XSI around for how it integrates and CrossTalk..... Who started the non-linear workflow? None of this means much to archvis.
To re-iterate, I think Max is a better solution for architectural visualization. Branko and Bullseye, thanks for your replies, I actually have fun, I use to do a Mr. Know-It-All type column/thread, it was tongue and cheeck, but I miss doing that kind of thing. We need people to balance my obnoxious demeanor

I like feeding off peoples responses.