Here's a thread on the differences...
http://www.cliosport.net/forum/showthread.php?t=171750
I had 2 Williams 3's. Opted for them because I wanted the most recent available. The manufacturers always know what the faults from the first batch are and can smooth them out etc. Perhaps not the case with the Williams, but it did have a sunroof too
First one I had, wheels ruined it imo...
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Second one...
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Better alloys but still ended up putting the originals back on.