Not very impressive.
It is more than a year since I bought this. I was excited at first to have a battery charger to quickly charge in 15 minutes. There were several times that we were about to go for a trip and that I remember I do not have any ready AA batteries for my gadgets. If I still have 15 mins, then it is not too late.

Pros:
-It works OK with the Sony batteries it came with

Cons:
-It does very poor charging with other batteries other than Sony's. (Even if the fan and the light has turned off. Batteries are still far from fully charged). Particularly batteries that has lower than 2500mAh ratings.
-Usually you have a retractable prong on the charger itself to plug it on the wall. This one has a separate power supply that is as big as a brick! What's with that?
-You need some muscles to place and remove the batteries from the charger. This part of the design is strange and baffles me.
-A little loud (it has a built-in cooling fan)
-Expensive

Recommendations:
Check out the new low discharge batteries from Eneloop (Sanyo), Rayovac, Kodak, etc. before even thinking of buying this.

the need for speed
If short charging time is the most important issue for you, this is the unit to get. If you take a lot of indoor photos for example, one set of batteries can charge in the time that you are depleting another. If your main purpose for using rechargeables is to reduce waste, perhaps you might obtain longer overall battery life with a slower type charger. It seems possible that leaving freshly charged batteries in the charger may cause some drain. ( I prefer to always remove them promptly when fully charged )

Effective recharger
It is amazing to get your batteries fully recharged in only 15 minutes. Besides that, it is a quality valued product. The only thing I missed is the function of emptying the batteries before recharging them. Despite that, I would definitely recommend it.

not reliable
After a year or two of very rare use (maybe once every 2 months), this charger stopped working. I can put any batteries in it and it always fails to charge. You'll know by the dreaded blinking light.

Another Sony product bites the dust...
I must have a Sony curse or something... everything I buy from them breaks right after the warranty expires... 2 camcorders, 2 discmans, my PS2...
This worked great for a while, but then started rejecting batteries left and right. I had to re-insert them about 10 times to get the charge to begin. Ironically, it won't charge the included Sony batteries at all, but still kind of works with my energizers...