Hey Edwin,
I still have one, but i haven't used it in many years. I've been tempted to try it with the newer amps too, but I'm too lazy to pull it out of storage. Mine came with an OEM cast-frame driver that might have been an Eminence, and I also tried an EVM-15B. As i recall, I preferred it with the port covered.
Uncovered, the port made slight "chuffing" sounds. Though the low end sounded fatter to a point, it seemed like the driver became unloaded at low frequencies, and high volumes made it worse. I even bottomed the driver out a few times, which was pretty scary.
With the port covered, the lows were softer, but it was easier to boost lows with EQ. Though it's somewhat large, i think the cabinet was designed more with 4-string basses in mind. For 40 bucks? I'd go ahead and buy it.
thanks,
-nate.