Just been looking at loads of previous posts concerning running a y-piece and standard can....and the potential problems of melting various bits of plastic. I have just bought a bike that is running this set up and am just weighing up luggage options. My preferred choice is TT zega pros ( cos I already have the panniers so only need to buy the frames ) but I was also thinking about the system cases because the bike came fitted with the rails . Any experience of these set ups or advice on which way to go would be appreciated.