I got my Synesso with a Pullman tamper I bought from Cuppacoffee. I had a Gaggia Baby at the time and it certainly was an improvemnt on that (holes more uniform, pour was more even). I cant see much difference at all between teh basket that came with my Levetta and the Synesso. In fact I had to have a very close look to work out which one was the Synesso.
If you already have a VBM I think the only reason you would get a Synesso is if it comes as a match with a tamper purchase or for some reason you need another basket