Oh wow... Maybe we experienced completely different software versions or something, but for me the 220XL was THE sound of Dave Bascombe/Trevor Horn/Steve Lipson/Julian Mendelsohn mixes in the 1980's.
Like the PCM80, NOTHING does what the XL did to a piano, when you rolled in a 'chorus' parameter setting of 54-56 in a reverb tail. (settings 00-50 did NOTHING, and settings 60 and up were preposterous, but the mid-fifties brought GLORY to so many things!) I never -ever- (not even once) met a 224 which had that ability... but then this was the luscious excess of the 1980's, and I was addicted to that box as most Los Angeles hair-rock producers were to cocaine...
The 480 removed that parameter, and was the first step backwards after MANY steps forward, for Lexicon.
...To my ears at least.
Keith