As a GS3 owner, I can't see what all the fuss is about - IMO there are many comparable or superior options for better value.
The hype on these machines is absurd and subsequently so is the asking price.
Don't have time to run through a list of reasons why (and I need many fingers to count)......but take it from me as an owner of various machines, my GS3 would have to be the biggest disappointment to date. Even my Expobar Minore IV at home offers me far more joy.
Good luck with the sale of your Bezzera though and if you have your heart set on a GS3 for very personal or individual reasons that are important and/or valuable to you. then go for it.....