I think of the Megasquirt as a college course in injection systems. You can not get through this without learning allot. it can be very frustrating at times but the rewards outweigh the frustration.
When you buy a system such as a Wolf or Tec 2 or 3, what you bought is what you got, the Wolf is five years out of date before it is shipped to you.
With Megasquirt my first one that is five years old now, a simple fuel only unit back then now runs ignition as well as full time Baro correction with with full closed loop wideband O2 as well as other options added in. The versatility of the system is incredible. Your investment will not go out of date ever.