Behringer Ultrastack Bg412s

Pros: wattage,sturdiness, looks
Cons: wheels, clean sounds dirty

For the price this cab is really hard to beat. Construction is sturdy. Speakers are Jensen, even though not the greatest but not bad either. Compared to my Celestion speakers these sound cheaper and tend to produce some harshness that is not desirable on clean sound settings, yet on distortion it actually adds to the tone.
The cab sounds surprisingly good on full-on distortion.
There is plenty of power and this cab can handle all the way up to 250 watts.
The wheels are where you can tell that quality has been slashed. After complaining to Behringer they sent me a replacement wheels and again same problem - they won't ever move in the same direction and they seem to get stuck a lot. Again - not a huge problem considering the price.
If you play hard rock or metal and you're on a budget this 4x12 cabinet really delivers. If you're into clean sounds like Eric Clapton or SRV these speakers are most likely not for you.

Pros: Great bottom end and quality construction.
Cons: Less efficient than the big boys...

It's great to see a company putting out such quality gear at reasonable prices within the reach of the average musician. This cabinet has great bottom end and allows your tone to cut into the mix without sounding brittle. Not as efficient as a peavey 5150 or a Marshall cabinet but for the money it can't be beat for tone, quality construction and overall bang-for-the-buck!! Uli rocks.