We’ve had two Floriscount foals born at our farm this year and both have turned out very nicely.
This is the youngest he was born 6th of June and this was his first outing he is bred and owned by Mary Lou Winn he’s out of her SPS by Prince Thatch xx-Argentan who had a Quaterback, a Don Schufro and an Escolar before all of which have very good movement in common and the eldest got approved in Finland last year.
https://youtu.be/8RuLUqSUff4
This is the elder he was born April 10 his dam is our SPS by Don Bosco-Archipel-Perser xx
https://vimeo.com/129097537
This is one that was born on our farm a few years ago out of our Warkant-Hohenstein-Perser xx mare who is owned by Jan Graham-Marquardt. I’m told she went on to make EM in TX.
Overall I can say we’ve been very lucky with the Floriscount foals we’ve had on our farm 
https://youtu.be/N7OevY8m8Og
Quaterhall I only know from offspring I came across or worked on in practice. Not enough to comment on. But I’ve sat on quite a few Danciers by now and we also had a filly by him a few years back (out of the same mare that had the Floriscount)
https://youtu.be/6xLB9eSGjmQ
Same filly at 3 weeks old:
https://youtu.be/187hPk0B450
A friend had another Dancier out of her Wolkenstein II-Lemon Park mare. From all the one’s I’ve seen so far I’d say you want to watch size as they tend to be on the smaller side and the other think you want to pay close attention to is to chose a mare that has a solid walk as they can come short-strided. No pacers though that I’ve seen just lacking length of stride. Rideability was overall superb!
I’ve also heard a lot of people mention that Floriscount threw them hot I can say ours have been perfectly calm angels so far.
Good luck 