Old Joe, your friend does some amazing work!!
I have Dremel with a flex shaft, it is ok but I wanted something a bit nicer/ better. The air powered unit that CharleyL suggested is also available from HF. I have one of those for about 20 years https://www.harborfreight.com/pneumatic-18-in-micro-die-grinder-kit-60244.html It is a bit noisy as is the compressor I was using. So I bought a Rampower hand piece (45,000 RPM) it allows you to reverse direction , great with burrs, and I have the foot pedal speed Controller. Absolutely love it. And if you really want to go nuts you can get a Vortex F5 Ar power carver that spins at 400,000 rpm. It was a Christmas present a couple of years ago. It has a super quiet compressor, Yes my wife spoils me.
The higher the speed the more control. the bits don't grab they just cut, it is like writing with a pen. you can see the size difference between the Rampower and the Vortex. The guys who carve gun stocks use the Vortex type tools.
A flex shaft like the Foredom, has a lot of torque for heavier stock removal. So it really comes down what you plan on doing. I am a tool junkie.