Ok, 1st Lets look at MS1 Kits. Bearing on mind that we are taking aboit the venerable 'Rover V8' it is, in whatever way you look at it a cast off 1950's Buick Engine.
It really is not that complex, even in hugely tuned formats, and MS1 is vastly superior to what many think, and we have a huge happy customer base who think its just frankly super.
.....Enter maybe windows 10 Quad Core hi Intel massive CPUs with lots of expensive RAM, they they run better .... And so it is for MS1 vs MS2. If you have seriously highly tuned engine, and or want to squeeze the absolute Max BHP via tuning on a rolling road etc, or have track days then MS2 has its place.
It's MUCH more complex, and thats why we only supply kits with custom made Plug 'n Play looms, and obviously these cost more. My own Rover V8 is a 5.2 Full Race JED (John Eales) triple plenum V8. Built on a Rover 'Iceberg Block', bore and stroke gives 5.2cc, Billet Crank, Alloy Con-Rods short race pistons, Ultra Wild Cam shaft, massively ported heads, vernier timing gear, and a custom trumpet base with Triple plenums. 342 BHP at mad RPM. I ran this for a few years quite nicely on MS1 Kit, when we went to do MS2 and I fitted this new kit. It was not a 'stunning' change at all, it was better in places - tickover - due to the Cam and generally felt smoother, but my point is this is one hell of a bonkers engine, ......and MS1 worked pretty damned well on it for yonks !everything ....many people think 'bigger is better' when 'small and beautifully set up properly' will leave them standing.
We like MS1, you can run NOS, switchable mapping for LPG, even Traction Control if you want to, but for most its a good way to LEARN about the system, you can always upgrade the CPU in the ECU to MS2 if you really want to....And MS3 ?, State of the art, hugely complex, mouth wateringly superb, and very very expensive and somewhat wasted on a 60+ year old wedge head Rover V8, and that's why we like MS1, and for the right reasons MS2 as well. Don't rule out MS1 - it's affordable, easy to get to grips with and learn, reliable, robust and does exactly what it says on the tin - and then some.