Did you get him?
I love haflingers, as an exercise rider, I personally work with 4 of them. They all differ in personalities, but as a whole they are kind, willing, and have great personalities. They are used for driving and trail riding, however, there is one that as the owner put it "She's yours until you graduate" don't know what I will do with her when I am done with college, might actually have to buy her. I've "had" her for about 3 years now.
They are smart, and if you let your guard down, they will likely try to take advantage of it. Case in point, is said mare - Cinnamon, aka Lady Lumps, Irritable Haflinger. Some where she learned that if she kicked when you kicked, you would stop riding - so she tries it now, has a tantrum, and continues on her way.
Haflingers are easy keepers, aka, have tendencies to get fat. You'll need to exercise quite a bit and pay attention to their feed.
Their gait is amazing, as you can see in the tail end of the video as she trots after her tantrum, I hardly move. The mix or morgan x haflinger would be AH-MAZING in terms of smoothness.
As of saddle fit, you can see that she is a bit of a porker, to the point that its hard to find a saddle that fits her, she doesn't throw a fit if the saddle is too tight, but I know better so I just ride her bareback. Only use a saddle when I want to open her up into a full run *drifts off into a happy place* which I accidentally did once while bareback, Thank GOD she has all that mane to hold onto - she did not want to stop.
Over all , I like them. You should get one :)