I own 2008 model Storm driven 3400 Km.
No Major issue So far Its Rode grip is Excellent & PAR at CG Delux & GS 125/150. Fuel Consumption is also good as far as Pick up is concern u cant campare it with CG 125 coz CG 125 is less in wieght thats why it has more pickup in its class. But Honestly speaking CG 125 has nothing except its pick up & roaring sound. other competetor like Storm 125, GS, & even Cg Deluxe is far better than CG 125 classic.
Some of the minute issues being faced and already in knowledge of HKS engineering & i think they are working for fix them out.
The most known problems in Ravi Piaggio Storm are as below,
1) Chain cover knocking
2) Fuel gauge vibration.