Lets put this into perspective...
If MoTeC announced it was releasing the M800 in a straight plug in to suit most versions of Skyline, with all the add-on's for $2500 you guys would be raving about it.
This ECU is more suited to the driver/owner who wants a little more from their car, attends regular track days and is involved with the modification process of their vehicle. If your car is tuned and its a set and forget daily driver then yes it may be a little hard to justify the additional expense.