Enclosure gives you plenty of volume and clean low end. 4x10" cabinet has the same speakers and 1" horn as the SVT-410HE with 2" coils and 30 oz. magnets, but the cab is tuned differently. It's deeper and has a bottom port that results in better low-end response, down to 28Hz.
I used it to fill out the sound in a 3 piece when we started playing larger venues and I needed the volume over the drummer and guitar players two amps :)
The build quality is very sturdy,I would recommend getting a custom made flight case if you plan on touring with it as the tolex can suffer from wear and tear.
The cabinet delivers the quality that you would expect from Ampeg and will also retain its resale value because of this.