Yes Yamahas have many outstanding features, but they aren't perfect for sure.
I haven't had one in a year or so, but I can recall several flaws that they refuse to address.
A vocal harmonizer that blips EVERY time you engage it while singing a note (through the same vocal processor that was introduced on the PSR8000),
The worst-sounding rim shot in captivity (on drum kits that have not significantly changed in many generations).
Inability to include a simple usable slow Country Waltz. (You have to use converted ones from other brands, or make your own).
Refusal to include foot switch capabilities except for single pedals (unless you want to buy a very expensive, very large and very heavy MFC-10).
I could go on, but you get the point.
No arranger is close to perfect. There are compromises to be made with all of them. Some of the compromises are more or less important to the individual user, depending on his or her priorities and needs.
DonM