They are are unbeaten in 12 matches in all competitions against Reading (W8, D4) and the last time they lost to them in the FA Cup was way back in January 1927.
The Red Devils have also won 15 of their last 19 home ties in the FA Cup (D2, L2), and come into the game on the top of their form following an excellent 1-1 draw in the Champions League against against Real Madrid at the Bernabeu.
They really should be able to get the job done with the minimum of fuss, and although they are plenty short enough in the outright match betting I think there is a bit of value to be had in other markets.
Both those prices look fair, but if the gaffer decides to give him a rest then Hernandez could get a run out and would be of interest in the same markets at 5 and even money (2) respectively with Ladbrokes.
Related items from Red Rants: