I've been on the 170/75s for over four years with only two cancellations for maintenance. I'd wager that that is as reliable as any other platform out there. Sure it had teething pains like any new platform. Pretty minor compared to others such as catastrophic uncommanded rudder displacements on the 737s. As a coast to coast commuter, I've been delayed on every type of jet imaginable for maintenance. Still, I'd rather be flying a Boeing. Best built transport planes flying.