They'll definitely go fast enough to get in trouble pretty quick.

My brother has an Ultra Stick 40 with OS 70 four stroke. He installed the quad flaps to play with crow mixing. He rarely uses crow and says, if he had it to do over, he would just install the full length ailerons and save the weight and expense of the two extra servos you need for the quad flap setup.

He likes the US40 a lot. The US40 is $130 from Horizon. No tax, but they charge a lot for freight. The hobby shops around here sell for the same price as Horizon but we pay sales tax. Out the door it would be 140.71.

That is 50% more than the CH Stick. For that much price difference I'd consider it. Because of super saver club and a gooddiscount code I got my GP stik for only 5 dollars more than the same size CH stick.