Having just been on NZ LAX-LHR (yet again) in business.
Food, drink and service are great.
Seats are old - will be much better when upgraded to suites (like VS Upper Class) starting mid 2005.
IFE limited to 8 channels each with 2 cycles. Again, will be better when refurbished starting mid 2005 - going to AVOD system with hundreds of channels.
Major downside of this route is LAX.
However all up I prefer NZ to LH business trans-atlantic even with hassles at LAX (and LHR to lesser extent).