I would imagine Resistors vary in stability like any other mold from MVP, for example i had a blue N servo that was flippy and then i got a white N that was straight and fade. However, i have personally never seen a resistor that was flippy or had any turn out of the box but ive only owned 3. Mine have all been reliably overstable but maybe slightly more/less dump to the fade.
The oldest one i have that is beat in, I would give it a -1 turn, 3 fade, it holds a beautiful straight line with a long drifting turn that doesn't flip over and has retained that dumpy late fade that makes it easy to range. It took a long time to get there. Out of the box my max weight resistors are def 0 turn and 4 fade!
Its not a beginner disc in my opinion because of the low glide and dump fade newer disc golfers would probably not get much distance or appreciation out of the Resistor, but for someone who plays more advanced that has more power and variation of throw styles they will recognize right away the reliable flight, versatility and ease of ranging this disc. Resistors dont have much glide and the fade dumps. It can handle thumbers, forehand, etc.
I recommend using it as a replacement for all midrange discs. I find midranges less reliable/predictable due to glide and dome, the resistor will cut through windy conditions, you can flick it around obstacles more easily than a midrange class due to its lower profile and narrow blade shaped wing. Its going to dump on target whereas a midrange might glide past the target or get thrown off course more easily by wind. The only thing lacking then would be a straight flight without much fade or anny lines and thats what putters do best!
I notice a trend in pros opting to use faster putters instead of midrange class discs for shorter drives or midrange throws and then jumping right up to slow fairways for anything too long for a putter. Just want to point out that in my experimenting i have found this to be a successful approach.