I did my CBT a couple of years back, owned a Hyosung GT125R for 4 months, taught myself to ride on it and passed my test on it.
Wouldn't recommend it purely as it had quite a sporty riding position (they made a non-R also which was more upright) which isn't ideal for learning / figure of 8 etc. It also needed bump starting quite a bit in the winter
As soon as I passed my test I bought a Suzuki SV650S, then a year later I sold that and bought my current Kawasaki Z1000