We usually use 275/.73 for climb. That numbers gives on average day (ISA-+some and weights at 22ish) 15mins to TOC. Reasonable fuel burn is also a benefit. But I like to think, that you can save much more fuel, if you can be until 75 miles on level and then make a continous descent to final. The fuel burn difference between 3.0' decent and 4.5' decent is quite remarkable. To meet our dispach expectations about fuel burn, we fly - 275/.73 on climb, .77 on cruise and leave the decent as late as possible (excluding VKO and London airports). And dispatch got their fuel burn numbers from the flight manual...
And remark about altitudes.
Also, I have been once in F470 (weight mid18s, ISA-9, empty leg), and it was pain to get there (last 200 ft the roc was ~40ft per minute) . It seemed impossible to get higher, but it was quite stable at .75 on altitude, disregarding the 'humming' from the wings.