I've got one in the box. It looks nicely made, if I remember correctly it calls for a .25~.38 2 stroke. It's smaller than my Kyosho TM which I have a OS .52 in. I plan on putting a Saito .40~.45 in it, I'm leaning toward the .40. I think the .52 in the Kyosho is a little too much motor, I fly it at 1/2 throttle most the time. TMs aren't Pitts, they don't look good when overpowered, more than loops and great stall turns it's out of charactor. My .50 Saito is my favorite motor on a Sig LT-40, I had 14 engines on it, and the LT-40 is twice as big, so unless you put a big low pitch prop you'll always be over speeding it.

So to make a long story short:

It's a nice plane for a ~.30 2 stroke or a ~.40 4 stroke, and mild acrobatics.

The Saito .50 would power a Sig SunDancer 50 well.