Here’s some info from another forum
Spider IV 75 a Great Product Made Even Better Based on Extensive Market Research & Line 6 Insight!
SPIDER III: WHAT WORKED
Unmatched Range of Tone with Line 6 Amp Models from Clean to Insane
Smart Control FX Are Easy to Dial In and Sound Great
Instant Rock Star Connection via Hundreds of Artist and Song-Based Presets
Universal Praise for Spider III’s Look