I see that I'm not the only one here with the supercharged 120. Here's my list:
FP 40 times 2
FX 40 parted out after second liner peeled
SR 40 what a great old engine!
FSR 45 was a heli converted to fixed wing - nice runner
SF 45 brand new
FX 46
FS 48 Surpass
FS 91 Surpass
FS 120 II Surpass Pumped - great running engine
FS 120 SP Supercharged Not such a great runner, but unique
And coming - an FX 91 for my TF P-51.
No engines are perfect, but I love my OS collection! I wouldn't be nearly as into R/C if I couldn't run them.
Sandy T