The Acuvar batteries are still holding up well for me. I did have to discard two of them, but the other six are fine. I use Acuvar in one of my TWAs and Eneloops in the other. Eneloops last longer than the Acuvar, but I don't have power issues with either of them. Eneloops win for me.
I've had the Pro 2450 for almost a year now and they're still running strong! I'm kind of waiting for the Acuvars to go out completely so I can try these EBL batteries.