Can't praise Nengun enough.
I have ordered at least £5K worth of parts from them (I don't really want to tot up the real value, I might be in for a shock!!), and it all arrives pretty much when they say it will. Predicted dates and tracking numbers given on oreder confirmation (although the EMS tracking service is not that great).
Occasionally, you will have to wait some time before the parts arrive. My guess is that Nengun don't stock much if anything, so normal lead times from the manufacturers apply.
Use them with confidence, you won't be sorry.
I now have my eye on a Tomei crank, £2k delivered,:thumbsup: