Guaranteed delays and machine failure.
The only element which Keurig has mastered is that of accelerated planned obsolescence. I have had three of their K-Classic makers in four years. The only aspect more assured than the machine failing is the 6 minute time to brew a f**king cup of coffee. Have I sought a better option? YES. Is there one, no. They have the lock on the market, and I will go back to making lots of coffee when this model fails in, say, the next three months. AVOID AT ALL COSTS.