How on earth can you say you're not happy with the 195s and 331s when you haven't even been on one yet?
This is a forum where people end up having heated arguments about the seats on trains that aren't yet in service because their Spider-senses can apparently tell what's going to be comfortable from viewing an Artists Impression!
Based on my first impressions of seeing the 195s they look... okay... nothing exciting but then nothing that will age that badly - the fairly angular design could have been for a Network South East prototype thirty years ago - it's quite a functional look.
I previously thought that the short nature of them (and lack of corridor connections) would be a problem on routes like Sheffield - Wakefield Westgate - Leeds, but the industrial disruption on Northern seems to be choking off discretionary passengers so a two/three coach DMU may end up being sufficient in the short/medium term. The WMT franchise has given Arriva a bit of breathing space in that the 195 production line is potentially being kept open a good bit longer than initially expected, so if best comes to best then there are at least options for more stock.
But what Northern needs is more basic 75mph DMUs (which may mean hoovering up any and all 150s/156s from elsewhere) - the second hand market will have a number of 158/170/175/185s on it over the next couple of years, but most unelectrified Northern routes are basic ones where the DMU rarely gets above 50mph, yet alone the 75mph maximum speed of a 150/156. The economics of the franchise mean that we are doing well to get any brand new stock, so I'm not expecting additional 195s any time soon.