TJ13 Commented:
"Mercedes began work on this project several years ago whereas Renault and Ferrari started more recently. So any expenditure made by Mercedes will seem larger than their counterparts but even so, if rumours are to be believed, the finalisation of the design was recent. Ross Brawn allegedly took a look at the design last September and instructed the team to ‘think outside the box"
September 2013 !!
Thus Honda should not have any problems with their PU on power or reliability. IMHO