i was wondering if there are any similar problems as to which the cummins version has and if this machine is worth buying.
Original CX 210s - 99% of problems was fuel related on the Cummins motor. CX210B has been very reliable. The only issue has been injectors under warranty on earlier machines.
Isuzu uses much less fuel. Use a good filter with water block on the service tank when you fuel up excavator. Any moisture is very hard on the injectors.
They are a very good machine . If you are fueling out of a bulk tank , don't pull it clear to the bottom . Keep it 1/3 full at least , the moisture settles in the bottom . If you are using a portable tank , don't drag it down the road and then fuel it .