I love Kawi's. I've owned many of them- AC, LC and EFI. Never had a problem with any of them. However, if I bought a new machine and had a choice, the Vaguard would be my first pick.
The only real problem that I know of that was fairly wide spread regarding Kawi's were the two BB engines had vale and head issues when they first came out, but that has been fixed for a couple/few years now.