I have one which was bought fairly recently.
I rather like it but the volume has to be set quite high compared to other amps I have, the setting being around the 1 to 2 o'clock position. The other amps being an Orange 4 stroke & an Ashdown ABM 500 (both 500W Class A/B).
That said I have never run out of steam, so to speak (with the Ampeg).
I have mine running into a Barefaced Big Twin 2 or a Big Baby 3.
The B15 drive sound is really good - I've not really played with the SVT drive a lot so far.
I play in a rock band & a county (kinda vibe) band & they seem to like it too.