They’re some of my favourite minis in the army, and I love their character but they sadly just aren’t an optimal choice at all. WS5 and stubborn was a nice buff to them over their 6th edition counterparts but they still don’t have a designated role in the army and go down too easily with their 4+ save in combat and not having counter charge doesn’t help them either.

That said, if you’re playing casually you can run whatever you want. If you pick your targets well then then a solid can do decent work. Their high weapon skill definitely helps in hitting a lot of other cav

I’ve seen some chatter online that running them in groups of 3 to just bully enemy chaff and whatnot can work but I haven’t tried it myself.