Look on either talkbass.com or ultimate-guitar.com and you'll find hundreds of people who've had the same experience as me.
And actually, the behringer will probably not be more powerful. behringer like to rate their amps by the peak rating, which is not at what the amp actually runs at, it's the rating the amp can handle for short bursts in case of a power spike or whatever. What you really want to look at is the RMS rating, with a 300watt peak rating on the behringer it's likely to be really around 180w max, the same as the Ashdown, except the ashdown won't break on you or sound like an auditory holocaust.