I've never been a big fan of XJ220s, partially because they are nowhere near being the car that they were initially going to be (4x4, different engine etc, etc), but also because they're very big and a bit lumbering and ultimately not that technically cutting edge.
It all got very messy when they were launched and speculators climbed onboard, soaking up a lot of the slots.
When the revised spec was issued, and the bottom dropped out of the prestige car market, things got really ugly and tainted the car's image.