Well... the needle valve is not durrable. And its expensive. (so I got a Tower Needle at less than 1/2 the cost and the Tower remote needle IS durrable.)

And the backplate is not durrable... All too easy to tighten the backplate screws and snap the backplate screw holes off. (using light pressure and a jeweler's screwdriver...)

I finally got the hunk of junk to turn over 5K rpm (I have the .46) when I went to a 10X4 and 20% nitro. Now that its acting like its broken in... (2.5 gallons through it... I did give it a chance...) it still refuses to turn a 11X4 (which my O.S. .25 SF, older than dirt and more than 35 gallons through it.... can turn 11K) over 9K.

The .40 FP has more power.
The Old tower .40 bushing bearing version has more power.
A Magnum .40 GP has more power.

(and we are comparing these .40's to a .46!)

My old .25 has more power! I tink the LA.46 makes a good .19.[:'(]