Any experience with this type of waveform - am I going to be disappointed ?
Yes lots.
I think you might be dissapointed with the results. One cycle of a sax waveform is not going to sound like a sax when repeated. What gives sounds their unique tambura is the way the waveform develops over time. So a plucked string for example constantly changes the mix of harmonics it has in it so it sounds plucked. The same goes for other sounds like blown ones. Basically any waveform repeated will always sound like an organ with a diffrent arrangement of stops pulled out.