Good batteries for the price.
Bought two of them for vacation to DC. When they arrived one was dead and would not even charge, contacted the seller and they sent a new one in 3 days. Both batteries work great, hold a long charge, and took the DC heat walking the streets for 7-9 hours a day for the entire week. Only had to recharge one time for each battery all week. Would buy again no issues or reservations!

Good OEM Battery
I found the Ultralast battery to work well in my Canon SLR. I have only put it through a couple of charge cycles, but it seems as good as the original.

Lasts LONGER Than Original Canon Battery
I purchased a Canon 40D a month ago and then bought one of these as a backup battery. After comparing the two, it seems that under similar usage patterns, this battery actually outlasts the stock Canon one. This is the first time I've experienced a 3rd party battery which lasts longer than the original. I'll be buying another one of these before I go on a summer roadtrip.

Great Replacement Battery
Can't beat the cost or performance. Got this battery as a replacement for my OEM battery for my Canon 10D. Took over 100 pictures with flash and it was still going strong. Haven't recharged it yet.

Works as rated
I read other reviews and must say I agree. Product works fine and seller did a great job.