Someone on the XSI Mailing list asked about the old “10 reasons to try XSI”, which was published back in 2007 I believe. I managed to find a copy.

Here’s a comparison of the “10 reasons to try XSI” with the top reasons to buy Autodesk Softimage 2011
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2007 (XSI 6)
- Non-destructive everything
- Gigapolygon processing
- Modeling that feels like sculpting
- Delta Referencing: breakthrough collaborative 3D animation
- Commitment to scripting & development standards
- Animation Mixer
- Asset reuse made simple
- Render Passes
- Built-in XSI Illusion compositor
- Custom Display Host
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2010 (Softimage 2011)
- A Powerful Companion to Maya
- Node-Based Interactive Creative Environment (ICE)
- GigaCore High-Performance 3D Engine
- Complete Face Robot Toolset
- Nondestructive Workflow
- Interoperability
- Industry-Leading Nonlinear Animation and Mixing
- Production-Proven Solution
- Extensibility
- Autodesk Subscription and Support
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And here are some other top 10 (or 9 or 11) lists:
Top ten new features in SOFTIMAGE|XSI v.5.0
- Work with ten times the detail (Gigapolygon core)
- Gator – property transfer that just works
- Film-quality normal map generation
- Easy migration from Maya
- Integrated Tools Development Environment (“TDE”)
- Native mental ray v.3.4
- Shape manager for easy shape creation and animation
- Tweak component tool for fast freeform modeling
- High-performance rigid-body dynamics
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Top Ten Key Features in SOFTIMAGE|XSI v.4.2
- [NLA] SOFTIMAGE|BEHAVIOR v.2.0 In XSI Advanced
- [FX] Compositing and Hybrid Vector and Raster Paint In Essentials
- Character Development Kit
- Rigid Body Dynamics
- XSI Rendering and mental ray v.3.3
- Construction Modes
- [rendercore] AAF/MXF HD for Avid Editors
- [workforce] Alienbrain Studio 7.1 Plug-in
- Custom Display Host
- UV Unwrapping
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Top 10 Reasons to Care About XSI 3.0
Long-Form Film/Series Broadcast
- Fastest development rate in the industry
- Fully integrated hair and fur simulation subsystem
- Unique fully integrated professional film quality compositing environment
- XSI SDK
- Unique fully integrated high-end interactive rendering
- Legendary Softimage character animation tools
- Native non-linear animation
- Crowd simulation tools
- Fully integrated, internet-enabled workflow (Net View, Synoptic View, ActiveX Scripting Technology)
- XSI Batch and XSI BatchUniversal (purchased separately)
- Lowest cost high-end technology on the market (versus A/W Maya and RenderMan)
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