Mate, that rams really good. I've never actually used the Ballistix range from Crucial, however i've never had a problem with any Crucial RAM in the past. Go for it.
If you note though, the ram has a CL of 4, but the voltage is at 2.2v. If you manually set your XMS to 2.2V, you could get CL4 or maybe even a bit better at the stock speeds.
And as I said in other threads, if your RAM was only around 800MHz, then that wasn't the issue.