I've seen one person on Twitter who commutes Cumbernauld - Partick and one who commutes Alexandra Parade - Gartcosh complaining about loss of direct services.
Other than that the complaints mainly seem to be about cancellations (fair enough!).
Couple of tweets from people doing Cumbernauld - Edinburgh who are happier with the new service.
About what you'd expect really. The new routings have winners and losers while the main complaints relate to service reliability more than the frequency itself.