Well, i am glad to see that an MVVS specialist like Pé reivers is with us on that tread
As a professional engineer, i like to play with maths and unfortunately, all of us r/c modelers have tendencies to compare engines and performances without asking the real question!!
How many thrust do I need to fly my plane?
There are no bad engines on the market but only bad sizing for the airplane! Whatever if it's a Saito150, Enya155, OS160FX, MVVS1.6, we must check 2 things to select the right engine for a plane:
1) What's the require thrust to fly the engine (it depends of your flying style, aerobatics, pattern, 3D...)
2) What is the oz/sqft ratio of your plane?
In my case, i am building an Extra300l 73'' span. I want to try a gas engine for the first time but I will accept to lose some power because all glow engine have better weight/HP ratio than gas.
If I can build it at 10.5lbs instead of 11.5 lbs, i will have 28.5oz/sqft ratio and the MVVS1.6 can swing an APC18x10 at 7600RPM with a Bisson pitt muffler that gives me 18lbs static thrust and 1.7 thrust to weight ratio. This setup will be good for me to fly a lot, at low cost.
I dont know where you buy you 10% nitro fuel but in Canada, i pay 25$Can= 18$US/gallon.
Conclusion, keep your plane light and you'll enjoy!