A good friend of mine runs the Reedy 121VR-ST.
He has about 10 gallons on it and it runs great. He gets 10 minutes out of it easily. The motor has the strongest bottom end of any motor I've ever touched, it's insane. He's had to restrict it to make it controllable.

The motor also has the best mill work I've ever seen. When you get it, look at how clean the fins are cut into the case.
Also note that the bottom end needle uses a finer thread pitch than most engines. That allows you to make more precise adjustments and you also have to turn it more to make small adjustments. A 1 hour turn isn't noticeable.

Enjoy, you'll love it.