Hello Burgess,
If your charger works properly, I don't see any reason to be concerned. The original release of the C-9000 worked very well with healthy cells. The "improvements" were added because a large number of people were trying to use and recover "crap" cells.
This is not entirely true, but you get my drift...
In order to check out your unit, you will need to find a source of crap cells, because it is harder to get healthy cells to malfunction.
[sarcastic mode on]
You may be able to borrow some cells from a friend or neighbor that leaves them on the charger 24/7 to make sure they are always ready to go. This is one of the best ways to turn a healthy cell into a crap cell. The other source is to find cells that have been thrown into the back of the junk drawer. These are cells that stopped working well a while ago and were tossed into the back of the drawer instead of the recycle bin, hoping for a miracle to bring them back to life.
[sarcastic mode off]
To test your unit, you need to charge at the lowest charge rate, and set a timer. The charge should terminate after around 120-140% of the cells capacity has been put back in. The timer is a back up for you to terminate the charge if necessary.
The other issue is that the charger heats up when charging 4 cells at 2 amps. It is best to run this test with cells that are broken in and have been in constant use (i.e. NOT crap cells). Charge a set of 4 cells at 2 amps and check the temperature of the cells at the end of the charge. The cells should stay below around 140 F. Temperature is monitored at the negative end of the cell, so make sure your cells have good contact with the temperature monitoring strip when doing this test. This is not a test to run on new cells, or cells that have been in storage, until they have been properly broken in. The charger heats up while charging at 2 amps and some of this heat is passed on to the cells. If the cells are in a questionable condition, they will also heat up during a charge at this rate, and the combination can overheat the cells, sometimes melting the shrink wrap and sometimes causing the cell to vent. In the improved units, thermal paste has been applied to the junction of the temperature probe and the metal band that contacts the battery for better heat transfer.
My cells run up to around 120 - 130 F during 2 amp charging.
If everything checks out and works well, you are good to go.
Tom