I copped a ride on 331106 today from Sandal and Agbrigg to Leeds. They are amazing trains, and I really enjoyed my journey. The seats are poor, but perfectly acceptable for the metro journeys they are to be used on. Of course being ironing boards, you so worry, but thankfully it's of a different design to the GTR and ScotRail variants, so is tolerable.
The announcements were thankfully broken, so no comments on those. There was an annoying whirring sound throughout the journey, coming from the ceiling, might have been aircon.
Ride quality was good, and performance was good too. The doors are a bit slow to release, but it seemed to mostly be them trying to figure out how to open them, so that should sort itself out. Build quality was faultless to me.
I can definitely see these electric sets becoming a firm favourite for passengers in this area. Next up - the diesel units, on a 158 to pick up a set from Manchester. Very impressive stuff so far.