Our first one was just a bit louder than normal. The one we have now, though, will just sit there and yowl. Not asking for anything -- just sitting on the couch and meowing full blast while looking calmly at us. 

It's our ragdoll, though, who's affectionate towards our dog (and was to our previous one). 

I had one as a young child, and I have one now. This guy doesn't hold true to the stereotype. He's talking more as he ages, but no more than the other cats I have owned. You are right that they are very sweet. Ours is even affectionate to one of our dogs. 

siggy47

I've had two Siamese over the years (including one now), and man are they chatterboxes. But also such sweet cats.