All the newbies need to know is:
1. Buy a STABLE gyro with a good safe reputation. Some examples are Dominator, Monarch, Magni, CLT AirCommand (only), SparrowHawk, SportCopter, Xenon and others.
2. Get training from a properly rated gyro CFI. Even if you are a rated high time pilot in everything but gyros you still NEED gyro specific training.
If you have 1 and 2 you can ignore 3 and 4 below...
3. All currently in business gyro kit manufacturers are selling safe stable machines. However, one company that did make unstable gyros with known design flaws might be starting business back up in South Africa. If the machine you are looking at does not have a Horizontal Stabilizer it is almost certainly NOT a safe stable machine. The test described in this thread fails on these machines past certain airspeeds.
4. Those that need to do the tests described in this thread are mostly experienced pilots that own a machine that is scratch-built or of a legacy design (high thrust line). If this test fails there are ways (described in other threads) to enhance the stability and safety of your gyro.